If x is the principal square root of 7, what must be true.

A. x = 7², and x is negative

B. x² = 7, and x is positive

C. x = 7², and x is positive

D. x² = 7, and x is negative ​

Answer:

A would be correct

Step-by-step explanation:

the answer is A.

\(10:\dfrac{1}{5}=10\cdot5=\boxed{50}\)

Answer:

50!

Step-by-step explanation:

hope it helps thanks to the first person who helped

Answer:

IM NOT SURE

Step-by-step explanation:

IM ALSO DOING THIS

Answer:i DIO! think the answer would be 50

Step-by-step explanation:

if im correct please give me brainly wrrryyyyy... (yes im a weeb)

72/360 = x/10pi

1/5 = x/10pi

x = 2pi

6.3 cm

Answer:

W=13.2

Step-by-step explanation:

W-9.96=3.24

Add both sides by 9.96

W=13.2

answer- defend the answer because the inference could be made by someone who has no idea what is in the jar

The value of g(h(10)) is 2√2. the correct option is A.

Given that the functions are g(x)=√x-4 and h(x)=2x-8.

A function is defined as the relationship between a set of inputs where each input has an output.

Firstly, we will find the value of h(10) by substituting x=10 in the function h(x)=2x-8.

h(10)=2(10)-8

h(10)=20-8

h(10)=12

Now, we will find g(h(10)) where h(10)=12.

By substituting h(10)=12 in g(h(10)), we get

g(h(10))=g(12).

Further, we will find g(12) by substituting x=12 in the function g(x)=√x-4, we get

g(12)=√(12-4)

g(12)=√8

g(12)=2√2

Hence, the value of function g(h(10)) when g(x)=√x-4 and h(x)=2x-8 is 2√2.

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The probability that the sample's Republican percentage will be higher than 44% is 0.089.

Probability is a metric used to express the possibility or chance that a particular event will occur.

Probabilities can be expressed as fractions from 0 to 1, as well as percentages from 0% to 100%.

To determine the probability of a sample proportion, the normal probability is used as the z-test statistic of one sample proportion.

When the sample size is big, the z-test statistic, a normal test statistic, is employed.

So, the probability will be:

We know that the sample size is n = 488 and the proportion is p = 0.41.

Now, obtain P(p > 0.44) as follows:

\(\begin{aligned}& P(\hat{p} > 0.44)=1-P\left(\frac{\hat{p}-p}{\sqrt{\frac{p(1-p)}{n}}} \leq \frac{0.44-p}{\sqrt{\frac{p(1-p)}{n}}}\right) \\& P(\hat{p} > 0.44)=1-P\left(Z \leq \frac{0.44-0.41}{\sqrt{\frac{0.41(1-0.41)}{488}}}\right) \\& P(\hat{p} > 0.44)=1-P(Z \leq 1.347)\end{aligned}\)

Excel function for the p-value:

P(p > 0.44) = 1 - 0.911

P(p > 0.44) = 0.089

Therefore, the probability that the sample's Republican percentage will be higher than 44% is 0.089.

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Answer:

x - 4 yards.

Step-by-step explanation:

Given:

Area of rectangle = 3x^2 - 12x square yards

Width = 3x yards

To find:

Length of rectangle

Solution:

The area of a rectangle is equal to the product of its length and width.

Area of rectangle = Length * Width

Substituting the given values, we get:

3x^2 - 12x = Length * 3x

Length =( 3x^2 - 12x )3x

Length = x-4

Therefore, the length of the rectangle is x - 4 yards.

Answer: The length of the rectangle is x - 4 yards.

Step-by-step explanation:

We can create an equation to solve this word problem, where the variable L = length.

3x  ×  L  = \(3x^2 - 12x\)

We need to solve for the variable L, to find the length of the rectangle.

First lets factor the right side of the equation to make it easier to divide with.

3x  ×  L  = \(3x^2 - 12x\)

We can factor out 3x from the right side of the equation.

3x  ×  L  = 3x(x - 4)

Now we need to get the variable L by itself (isolating the variable). In order to do that, we can divide both sides by 3x.

3x ×  L  = 3x(x - 4)

/3x           /3x

L = x - 4

The length of the rectangle is x - 4 yards.

Answer:

Step-by-step explanation:

H(n)=91x(-1/7) n-1

do not know

Hope it helps the answer is the 2nd one have a great day

That's not a function.

Since a vertical line hits the graph more than once, if fails the test. (See graph below)

If it is a function, any vertical line you draw can only hit the graph once.

The equation can be given as B=64+5x

And the cost of phone bill if he uses 23GB will $104

What is an linear equation is one variable?

An linear equation is an equation of degree one. the highest exponent is 1 and one variable is number of variable is 1 in the equation

We are given that, Simba pays $15 per month for the phone he bought. His cell phone plan costs $49 per month.

He pay additional $5 for 1 gb data after 15gb data limit got over

Let the number of gb's used be x

Hence the total bill will be given by the equation

B= 15+49+5x

B= 64+5x

If he uses 23 gb of data the first 15 Gb are covered in his phone plan

And he has to pay $5 for each gb

The total cost is 8*5=$40

Hence the total phone bill is B=64+40

B=$104

Hence the equation can be given as B=64+5x

And the cost of phone bill if he uses 23GB will $104

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Answer:

(5-7)^2 because g(x) is the value of h(x) squared

x-7, s = 5

5-7)^2

Step-by-step explanation:

Answer:

c > 9

Step by Step explanation

Answer:

Set A

Step-by-step explanation:

Reflection is a flip, so you need to flip the rectangle over the x-axis. So since the rectangle will end in quadrant 4, the x coordinates are all positive and the y coordinates are all negatives. Look at your choices and see what you can eliminate. Set B & C are out because they have negative x coordinates. Set D is out because the y coordinates are NOT negative, so that leaves Set A as the answer.

Using simple interest, the amounts she invested are given as follows:

Simple interest is used when there is a single compounding per time period, usually measured in years.

The amount of money after t periods in is modeled by:

A(t) = P(1 + rt)

The interest accrued after t periods is modeled by:

I(t) = Prt

In which:

She had two investments, investing a total of $4500, hence:

\(P_1 + P_2 = 4500\)

The return for the 9% investment exceeds that from the 6% investment by $180, hence:

Then:

\(I_2 = 0.06(4500 - P_1)\)

\(I_1 - 180 = 0.06(4500 - P_1)\)

\(0.09P_1 - 180 = 0.06(4500 - P_1)\)

\(0.15P_1 = 450\)

\(P_1 = \frac{450}{0.15}\)

\(P_1 = 3000\)

Which is the amount invested at 9%, hence the amount invested at 6%, considering that a total of $4,500 was invested, is given by:

4500 - 3000 = $1,500.

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3a. An equation in slope-point for this line is y + 2 = 1/2(x - 0).

3b. The equation in slope-intercept form is y = 1/2(x) - 2.

4a. An equation in slope-point form to represent this function is y - 3875 = -1/695(x - 19375).

4b. The cost of operating a car that has been driven 31250 km is $3892.086.

In Mathematics and Geometry, the point-slope form of a straight line can be calculated by using the following mathematical equation (formula):

y - y₁ = m(x - x₁)

Where:

Part 3.

First of all, we would determine the slope of this line;

Slope (m) = (y₂ - y₁)/(x₂ - x₁)

Slope (m) = (0 + 2)/(4 - 0)

Slope (m) = 1/2

At data point (0, -2) and a slope of 1/2, a linear equation in slope-intercept form for this line can be calculated by using the point-slope form as follows:

y - y₁ = m(x - x₁)

y + 2 = 1/2(x - 0)

y = 1/2(x) - 2

Part 4a.

Based on the information provided about Jay's business, we would determine the slope of the line;

Slope (m) = (y₂ - y₁)/(x₂ - x₁)

Slope (m) = (3900 - 3875)/(2000 - 19375)

Slope (m) = 25/-17375

Slope (m) = -1/695

At data point (19375, 3875) and a slope of -1/695, a linear equation in slope-intercept form for this line can be calculated by using the point-slope form as follows:

y - y₁ = m(x - x₁)

y - 3875 = -1/695(x - 19375)

Part 4b.

For the cost when x = 31250 km, we have:

y - 3875 = -1/695(31250 - 19375)

y = 17.086 + 3875

y = $3892.086.

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Answer:

option D

Step-by-step explanation:

the values of x are where the graph meets the x-axis.

both values of x are found, in this case, using the quadratic formula,

x = ((-b ± √(b² - 4ac)) ÷ 2a)

our equation is y = 3x² + 5x + 1.

so -5 is -b, b² is (-5)² = +25.

4ac = 4(3)(1) = 12.

√(b² - 4ac) = √(25 - 12) = √13.

2a = 2(3) = 6.

inputting the given equations of x, we get answers of -0.2 and -1.4.

option D is what we want.

Answer:

88.89%

Step-by-step explanation:

Step one:

given

a man buys eggs at RS 9.60 per dozen

what is the unit cost of the dozen of eggs?

unit cost = 9.60/12

= $0.8 per egg

He sold 20 eggs for RS 18

the unit selling price = 18/20

=$0.9 per egg

the percent gain is

=0.8/0.9*100

=0.888*100

=88.89%

Answer:

Add I think

If there is a plus sign shouldnt it be adding

Answer:

E) An observational study using a stratified sample.

Step-by-step explanation:

This study is not an experiment because the customers were not subjected to any treatment but just observation from those selected. Also, the sampling method used was stratified sampling because we see that random samples were selected independently from two unique populations which are population of those that purchased computers and those that offer tech support.

Therefore the correct option is E.

The equation of the perpendicular line is y = -1/3x

From the question, we have the following parameters that can be used in our computation:

y = 3x + 2

The equation of a line can be represented as

y = mx + c

Where

Slope = m

By comparing the equations, we have the following

m = 3

This means that the slope is 2

The slopes of perpendicular lines are opposite reciprocals

This means that the slope of the other line is -1/3

The equation of the line is then calculated as

y = mx

Where

m = -1/3

So, we have

y = -1/3x

Hence, the line has an equation of y = -1/3x

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Step-by-step explanation:

everything can be found in the picture

Answer:

x=15

Step-by-step explanation:

Hi there!

We're given a right triangle with the measures of the 2 legs (sides that make up the right angle). We're also given the measure of the hypotenuse (the side opposite to the right angle) as x

We need to find x

The Pythagorean Theorem states that if a and b are the legs and c is the hypotenuse, then a²+b²=c²

Let's label the values of a, b, and c to avoid any confusion first

a=12

b=9

c=x

now substitute into the theorem

12²+9²=x²

raise everything to the second power

144+81=x²

add 144 and 81 together

225=x²

take the square root of 225

15=x (note: -15=x is technically also an answer, but since lengths cannot be negative, it's an extraneous solution in this case)

Therefore, the side length of x is 15

Hope this helps! :)

Answer:

A person with itchy eyes

Step-by-step explanation:

The doctor prescribes the drops to Felipe for his itchy throat and eyes and to keep him from sneezing.

Answer:

A person with itchy eyes

Step-by-step explanation:

I took the exam and got it right

Answer:

Step-by-step explanation:

-3≤ x = graph 6

-3 > x = graph 3

x≥ 3 = graph 2

x ≤ 3 = graph 4

3 > x = graph 1

x > 3 = graph 5

the closed circles means greater/less than or equal to

the open circle means greater/less than

the direction of the arrow tells you if the number is greater than x or less than x

The parabola \(y = √(x - 4)\) opens upward.

The parabola y = √(x - 4) represents the square root function of x minus 4. To determine the direction in which the parabola opens, we examine the behavior of the square root function.

The square root function (√x) returns non-negative values for non-negative inputs. Since the expression inside the square root, (x - 4), must be non-negative for real solutions, we have x - 4 ≥ 0. Solving this inequality, we find x ≥ 4.

This means that the parabola is defined for x values greater than or equal to 4. As we increase x from 4, the value of √(x - 4) will also increase. Therefore, the graph of the parabola opens upward.

The parabola \(y = √(x - 4)\) opens upward.

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