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3 years ago

(8y-4) -2(1/4y+3) so I'm doing add & subtract expressions and really need the help

Mathematics

1 answer:

Marat540 [252]3 years ago

5 0

Answer:

7 1/2y +2

Step-by-step explanation:

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A square has a side length of 3x3y5. What is the area of the square?

kotykmax [81]

Answer:

9x^3 y^5

Step-by-step explanation:

Since the formula to finding area is (L*W = A), we first have to find the width.

Width: 3x^3 y^5 times 2 = 6x^3 y^5

Then we add them. So, 3x^3 y^5 + 6x^3 y^5 = 9x^3 y^5

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3 years ago

Which expression is equivalent to 2cos^2(x/2)- cos(x)? Edge 2020

olchik [2.2K]

Given:

The expression is

$2\cos^2(\dfrac{x}{2})-\cos (x)$

To find:

The expression which is equivalent to the given expression.

Solution:

We have,

$2\cos^2(\dfrac{x}{2})-\cos (x)$

We know that,

$\cos x=2\cos^2 (\dfrac{x}{2})-1$

Using this formula, the given expression can be written as

$2\cos^2(\dfrac{x}{2})-\left(2\cos^2(\dfrac{x}{2})-1\right)$

$=2\cos^2(\dfrac{x}{2})-2\cos^2(\dfrac{x}{2})+1$

$=1$

Therefore, the given expression is equivalent to 1.

4 0

3 years ago

A mixture of 60 liters of paint is 25% red tint, 30% yellow tint and 45% water. 9 liters of yellow tint are added to the origina

Jlenok [28]

The percentage of yellow tint in the new mixture will be 39.1304...%

Explanation

A mixture of 60 liters of paint is 25% red tint, 30% yellow tint and 45% water.

So, the amount of yellow tint $=(60*0.30)liters= 18$ liters.

Now, 9 liters of yellow tint are added to the original mixture. So, the total amount of yellow tint in the new mixture will be: $(18+9)liters= 27$ liters.

And the total amount of the new mixture will be: $(60+9)liters= 69$ liters.

So, the percentage of yellow tint in the new mixture $=\frac{27}{69}\times 100\% = 39.1304... \%$

6 0

3 years ago

Shawna can paint a fence in 8 hours. Kevin can paint the same fence in 4 hours. How long will it take them working together? Sho

saw5 [17]

Answer: 2.66 hours

Step-by-step explanation:

Shawana can paint a fence in 8hours which means in one hour she can paint 1/8 of a fence.

Kevin can paint the same fence in 4 hours, so in one hour he can paint 1/4 of the fence.

Together in 1 hour they can paint 1/8 + 1/4 = 3/8

Total hours for painting is 3/8 or 2.66 hours

6 0

3 years ago

Read 2 more answers

I’m thinking of three consecutive odd integers. When I add the larger two the result is nine less than three times the smallest

maksim [4K]

Answer:

Step-by-step explanation:

Let the 3 consecutive odd numbers be n, n+2, n+4.

(n+2) + (n+4) = 3n - 9

Collect like terms

n+n-3n=-9-6

-n=-15

n=15,

n+2=17

n+4=19

4 0

3 years ago