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Anna71 [15]
3 years ago
6

Simplify. (-7y^2+4y+9)+(6y^2-5y+9)-(2y^2-9y-2)

Mathematics
1 answer:
Natali5045456 [20]3 years ago
7 0

Combine like terms

-7y² + 6y² - 2y² = -3y²

4y + (-5y) - (-9y) = 4y - 5y + 9y = 8y

9 + 9 - (-2) = 9 + 9 + 2 = 20

-3y² + 8y + 20 is your answer

hope this helps

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What is the volume of the figure below if a = 4.5 units, b = 5.8 units, and c = 3 units?
Anastasy [175]

Answer:

The answer to your question is the letter C

Step-by-step explanation:

Data

a = 4.5 u

b = 5.8 u

c = 3 u

Process

1.- Calculate the volume of the rectangular prisms

Formula

Volume = a x a x c

Substitution

Volume = 4.5 x 4.5 x 3

Result

Volume = 60.75 u³

But there are two rectangular prism

Total volume = 2 x 60.75

                      = 121.5 u³

2.- Calculate the volume of the triangles

Formula

Volume = base x width x height

Substitution

Volume = 5.8 x 3 x 4.5

Result

Volume = 78.3 u³

3.- Total volume

Volume = 121.5 + 78.3

             = 199.8 u³

3 0
3 years ago
What is the molarity of a solution
Vika [28.1K]

Answer:

0.670. M

Step-by-step explanation:

Molarity can be expressed like this:

molarity =  number of moles /volume (L)

We know the volume, which is  2.37 L , but we need to find the number of moles. We can do this by dividing  67.3 g  by the molar mass of  L i C l :

number of moles  = mass of sample /molar mass

number of moles  =  67.3 g /(6.94 + 35.45) g/mol  = 67.3 g /42.39 g/mol

number of moles = 1.59 mol

molarity = 1.59 mol /2.37 L =  0.670. M

7 0
2 years ago
A. How much must be placed each month into a retirement account earning 15% compounded monthly if the value of the account is to
Roman55 [17]
Alright, so. In other words we're finding what is the interest amount of 1,000,000 at 15%. So:

1,000,000 x .15 = 150,000.


4 0
3 years ago
Explain in your own words what the mean of a negative exponent means?
BlackZzzverrR [31]
A negative exponent is the opposite of a regular exponent so for example, 5 to the power of -3 is 1/125 
7 0
3 years ago
Write -37.75 as a mixed number.​
Burka [1]

Answer:

-37\frac{3}{4}

Step-by-step explanation:

0.75 is equivalent to three quarters, or (3/4).

3/4 would be the fraction. -37 would be the whole number.

-37.75 = \boxed{-37\frac{3}{4}}

Hope this helps.

3 0
2 years ago
Read 2 more answers
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