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3 years ago

9.5x - 2.5 for x = 9 What is the solution

Mathematics

2 answers:

Oksana_A [137]3 years ago

7 0

Just substitue $9$ for $x$ in the expression.

$= 9.5(9) - 2.5$

$= 85.5 - 2.5$

$= 83$

Citrus2011 [14]3 years ago

7 0

Answer:

Step-by-step explanation:

The original equation is 9.5 times x - 2.5

9.5(9) - 2.5

9.5(9) = 88.5

88.5 - 2.5 = 86

9.5x - 2.5 = 86

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At the neighborhood Fourth of July party, Mrs. O’Conner plans to serve banana pudding. She plans to make two batches for every 9

Oduvanchick [21]

Answer:

16 batches are to be made for the party.

Explanation:

Given:

Number of batches for every 9 people= 2

Total number of people attending the party=72

To Find:

The Number of batches required=?

Solution:

Let the number of batches for 72 people be n

So, by cross multiplication method,

2 x 72 = n x 9

9n = 72 x 2

n = 8 x 2

n = 16

4 0

3 years ago

Y = 5x - 10 Can you solve for x

tensa zangetsu [6.8K]

Answer:

$x = \frac{1}{5}y + 2$ or $x = \frac{y+10}{5}$ (Not sure which one is preferred in your case)

Step-by-step explanation:

Key skills needed: Evaluating expressions

1) We are given: $y = 5x-10$

2) To solve for the x variable, we want to leave the term with "x" by itself.

This means we add 10 to both sides

--> $y + 10 = 5x$ (Since -10 and +10 cancel out to make 0 or nothing)

3) Then we divide by 5 on both sides to get "x" completely by itself.

-----> $\frac{y+10}{5} = x$

4) You can keep it as is so --> $x = \frac{y + 10}{5}$

or you can divide "y" by 5 and "10" by 5 and get --> $x = \frac{1}{5} y + 2$

(I am not sure which form is preferred one is preferred as the teacher matters)

Hope you understood and have a nice day!!

6 0

3 years ago

Read 2 more answers

The price of a pair of shoes is $45.90. The sales-tax rate is 5 percent. How much sales tax do you need to pay?

Airida [17]

45.90*0.05=2.295. The answer is $2.30 when you round it off.

5 0

4 years ago

Suppose that at a state college, a random sample of 41 students is drawn, and each of the 41 students in the sample is asked to

ra1l [238]

Answer:

The confidence interval for 90% confidence would be narrower than the 95% confidence

Step-by-step explanation:

From the question we are told that

The sample size is n = 41

For a 95% confidence the level of significance is $\alpha = [100 - 95]\% = 0.05$ and

the critical value of $\frac{\alpha }{2}$ is $Z_{\frac{\alpha }{2} } =Z_{\frac{0.05 }{2} }= 1.96$

For a 90% confidence the level of significance is $\alpha = [100 - 90]\% = 0.10$ and

the critical value of $\frac{\alpha }{2}$ is $Z_{\frac{\alpha }{2} } =Z_{\frac{0.10 }{2} }= 1.645$

So we see with decreasing confidence level the critical value decrease

Now the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{s}{\sqrt{n} }$

given that other values are constant and only $Z_{\frac{\alpha }{2} }$ is varying we have that

$E\ \ \alpha \ \ Z_{\frac{\alpha }{2} }$

Hence for reducing confidence level the margin of error will be reducing

The confidence interval is mathematically represented as

$\= x - E < \mu < \= x + E$

Now looking at the above formula and information that we have deduced so far we can infer that as the confidence level reduces , the critical value reduces, the margin of error reduces and the confidence interval becomes narrower

3 0

3 years ago

What is the greatest common factor of 40 and 27?

Olenka [21]

To find the greatest common factor of 40 and 27, we can first start by making a list of factors for each number.

The factors of 27 are: 1, 3, 9, 27

The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40

When looking at these numbers, we can see that 1 is the greatest common factor of both 40 and 27.

7 0

3 years ago