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4 years ago

9

Multiply the binomials (x - 8) (x + 8)

1 answer:

Phantasy [73]4 years ago

3 0

<span>(x - 8) (x + 8)
= x^2 - 8x + 8x -64
= x^2 - 64</span>

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sharon is making greeting cards, each card takes her twenty minutes to make. how many can she complete in two and a half hours?

olga2289 [7]

7 or 8 since 2 and a half hours isnt an even amount of time so thered be an extra 10 minutes

4 0

3 years ago

The following set of ordered pairs is an example of direct variation, find the constant ratio between the variables. (Hint: Find

Serhud [2]

Direct variation looks like
y=kx, so

k=y/x

<span>(2, 4) k=4/2=2
(5, 10) k=10/5=2
(7, 14) k=14/7=2
(11, 22) k=22/11=2

Answer:A.k=2.</span>

6 0

4 years ago

I need help how to do this. Please help

earnstyle [38]

The best method would be to cross-multiply. Multiply the figure on the top left with the bottom right. Then set it equal to the multiplication of the bottom left with the top right.
This would turn into:
-1(x-1)=2(x+3) Then distribute the multiplication through the parentheses.
-x+1=2x+6 Next, get all the variables on one side, and the integers on another.
2x+x=1-6
3x= -5
x= -5/3

8 0

3 years ago

I need help with this problem

Dmitriy789 [7]

Answer:

<h2>h = 15</h2>

Step-by-step explanation:

The formula of an area of a parallelogram:

$A=bh$

b - side

h - height

We have b₁ = 18 and h₁ 10 and b₂ = 12.

$b_1h_1=b_2h$

Substitute:

$12h=(18)(10)$

$12h=180$ <em>divide both sides by 12</em>

$h=15$

5 0

3 years ago

A researcher has collected the following sample data. The mean of the sample below is 5.

abruzzese [7]

Answer:

The coefficient of variation is 72.66%

Step-by-step explanation:

Data : 3 , 5 , 12 , 3 , 2

We are given that The mean of the sample is 5.

Formula of standard deviation = $\sigma = \sqrt{\frac{\sum(x-\bar{x})^2}{n}$

Substitute the values :

$\sigma = \sqrt{\frac{(3-5)^2+(5-5)^2+(12-5)^2+(3-5)^2+(2-5)^2}{5}}=3.633$

Coefficient of variation= $\frac{\sigma}{\mu} \times 100=\frac{3.633}{5} \times 100 =72.66\%$

Hence The coefficient of variation is 72.66%

8 0

3 years ago