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3 years ago

Help please!!!! Evaluate the expression when x = 4 and y = 9 4x+6y = ?

Mathematics

2 answers:

mote1985 [20]3 years ago

4 0

Answer:

Step-by-step explanation:

4(4)+6(9)

16+36

leva [86]3 years ago

3 0

Answer:

Step-by-step explanation:

if x = 4 and y = 9 then

4x + 6y ➡ 4 × 4 + 6 × 9 = 70

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MaryAnne has 90 quilt squares. She plans to use 32 of them to make a quilt. What percent of her quilt square stock is she using?

Gemiola [76]

Percentage = ( number used / total number) x 100

32/90 = 0.3555

0.3555 x 100 = 35.56%

Rounded to nearest tenth = 35.6%

4 0

2 years ago

Assume we need to estimate the mean of a normally-distributed population with great accuracy. Specifically, for significance lev

bulgar [2K]

Answer:

$n = 2662.56\sigma^2$

Step-by-step explanation:

We are given the following in the question:

Significance level = 0.01

Width of interval = 0.1

Population variance = $\sigma^2$

We have to find the sample size so that the width of the confidence interval is no larger than 0.1

$z_{critical}\text{ at}~\alpha_{0.01} = \pm 2.58$

Formula for sample size:

$n = \displaystyle\frac{z^2\sigma^2}{E^2}$

where E is the margin of error. Since the confidence interval width is 0.1,

$E = 0.05$

Putting these values in the equation:

$n = \displaystyle\frac{(2.58)^2\sigma^2}{(0.05)^2} = 2662.56\sigma^2$

So, the above expression helps us to calculate the sample size so that the width of the confidence interval is no larger than 0.1 for different sample variances.

4 0

3 years ago

Write the missing value above the variable. M-9=7

tia_tia [17]

M=16
16-9=7
hope this helped:)

3 0

3 years ago

Read 2 more answers

Write the equations included in the same set of related facts as 6×8=48

julsineya [31]

48÷8=6, 8×6=48, 48<span>÷6=8</span>

7 0

3 years ago

Read 2 more answers

viva [34]

Please read "Step-by-step" if you're having trouble

Answer:

x²(1- $\frac{1}{4}$ $\pi$ )

Step-by-step explanation:

Each side of the cookie dough is x long, since there is no given number, the diameter of the plate is also x, its as long as the square is wide, making the radius 1/2x.

The area of the cookie dough is x², the area of the plate is 1/4 $\pi$ x².

You have the equation x²- $\frac{1}{4}$ $\pi$ x²the equation has a Greatest Common Factor of x² so your factored equation is x²(1- $\frac{1}{4}$ $\pi$ )

8 0

3 years ago