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2 years ago

Simplify the following expression. -4(2x +6) +x2 -9

Mathematics

2 answers:

kompoz [17]2 years ago

7 0

Step-by-step explanation:

Use the Distributive Property:

$-8x-24+x^2-9$

Combine Like-Terms and correctly format:

$x^2-8x-33$

nevsk [136]2 years ago

6 0

Answer:

x² - 8x - 15

Step-by-step explanation:

-4(2x + 6) + x² - 9

= -8x - 24 + x² - 9

= x² - 8x - 33

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A certain car can travel on a highway for 350 miles on 15 gallons of gas and in a city for 280 miles on 18 gallons of gas. If th

user100 [1]

Answer:

The car's average 18 number of miles per gallon

Step-by-step explanation:

The car has different efficiencies depending if its used on highway or city streets.

The efficiency on a highway is:

$E_h=\dfrac{350}{15}\;\text{miles/gal}=23.33\;\text{miles/gal}$

The efficiency for city driving is:

$E_c=\dfrac{280}{18}\;\text{miles/gal}=15.56\;\text{miles/gal}$

We now that the car uses twice as many gallons for city driving as for highway driving. This means that, for every gallon consumed, 2/3 are for city driving and 1/3 are for highway driving.

Then, we can calculate how many miles makes the car on average as:

$E=\dfrac{1}{3}E_h+\dfrac{2}{3}E_c\\\\\\E=\dfrac{1}{3}\cdot 23.33+\dfrac{2}{3}\cdot15.56=7.78+10.37=18.15\;\text{miles/gal}$

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3 years ago

What is 9+10 haha yes

Lena [83]

Answer:

21 no just kidding 19

Step-by-step explanation:

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3 years ago

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which represents the solution(s) of the system of equations, y=x^2-2x-15 and y=8x-40? determine the solution set algebraically

Harrizon [31]

y=x^2-2x-15 (1) y=8x-40 (2)

8x-40=x^2-2x-15
X^2+10x-25=0
(x-5)^2
×=5 y=0

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3 years ago

Carlos has 10 more dollars and Jeremy Jeremy has $5 more than the show all together they have $80 what part of 80 does Michelle

blsea [12.9K]

She would have 60 dollars.

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3 years ago

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mafiozo [28]

Answer:

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Step-by-step explanation:

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2 years ago

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