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3 years ago

Evaluate the expression (2x + y) +5 when x = 4, y = 10.

Mathematics

2 answers:

stiv31 [10]3 years ago

8 0

Answer:

Step-by-step explanation:

The question is a under substitution, that's a given number will be used to replace a letter

So back to the question

(2x+y)+5

And x is said to be 4 and y is 10

Let's start solving

(2(4)+10)+5

Hope you understand it to this extent,any where you see x you will have to put the given value for x same goes for y

(8+10)+5

18+5

Therefore the evaluation is 23

Maru [420]3 years ago

7 0

Answer:

The answer is 23.

Step-by-step explanation:

Our equation here is (2x + y) + 5.

If x=4, and y=10, let's plug that in into our variables, and simplify!

[2(4) + (10)] + 5

= [8+10] + 5

=[18] +5

=23

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What is the times tabels of nines

Komok [63]

Answer:

8 because it is composite.

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

Reading proficiency: An educator wants to construct a 99.5% confidence interval for the proportion of elementary school children

Shkiper50 [21]

Answer:

A sample size of 345 is needed so that the confidence interval will have a margin of error of 0.07

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error of the interval is given by:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

In this problem, we have that:

$p = 0.69$

99.5% confidence level

So $\alpha = 0.005$ , z is the value of Z that has a pvalue of $1 - \frac{0.005}{2} = 0.9975$ , so $Z = 2.81$ .

Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.07?

This is n when M = 0.07. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.07 = 2.81\sqrt{\frac{0.69*0.31}{n}}$

$0.07\sqrt{n} = 1.2996$

$\sqrt{n} = \frac{1.2996}{0.07}$

$\sqrt{n} = 18.5658$

$(\sqrt{n})^{2} = (18.5658)^{2}$

$n = 345$

A sample size of 345 is needed so that the confidence interval will have a margin of error of 0.07

4 0

3 years ago

What is (3-6)/8-2+7/2

Sladkaya [172]

(3-6)/(8-2)+(7/2)
Do what is in the parenthesis first.
-3/6+3.5
-0.5+3.5=3

Therefore, your answer is 3
Hope this Helps!

5 0

3 years ago

Slope is 5, and (2,6) is on the line

tigry1 [53]

Y - 6= 5(x - 2)

y - 6 = 5x - 10
y= 5x - 4

3 0

3 years ago

A boat cost $11,800 and decreases in value by 10% per year. How much will the boat be worth after 8 years?

Brilliant_brown [7]

10%= .10
.10(11,800)= 1,180
1,180(8)= 9,440
11,800- 9,440= 2,360
= $2,360

I hope this helped.

5 0

3 years ago