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Alenkasestr [34]
3 years ago
5

What is the answer 9x + 7 = 8x + b

Mathematics
1 answer:
Scorpion4ik [409]3 years ago
5 0

answer/work:

9x + 7 = 8x + b

-8x         -8x

______________

x + 7 = b

   -7    -7

_________

x = b - 7

hope this helps! ❤ from peachimin

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The sales tax rate for a local county is 8.7%. If an item costs $184 (before tax), how much sales tax will be due?
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16.008 would be the sale tax
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4 years ago
Christine went shopping and bought each of her eighteight nephews a​ gift, either a video costing​ $14.95 or a CD costing​ $16.8
pogonyaev
So I think you should set up an equation like this: 14.95x+16.88y=131.18 , x+y=8

so x=8-y, plug this into the original equation:
14.95(8-y)+16.88y=131.18
Evaluate: 119.60-14.95y+16.88y=131.18
Combine like terms: 119.60+1.93y=131.18
Subtract 119.60 from both sides. You get: 1.93y=11.58
Divide both sides by 1.93. You get y=6

Plug into second equation: x+y=8 ---> x+6=8 and solve for x. x=2

Christine bought 2 video games and 6 CDs. 14.95(2)+16.88(6)=131.18
4 0
4 years ago
264 is 55% of what number?
SSSSS [86.1K]
I think 55% of 480 is 264
4 0
4 years ago
How do you solve: f(x) = -x2e-x<br> +2xe-x , finding the zero's of f.
Maksim231197 [3]

Answer:

0 and 2

Step-by-step explanation:

f(x) = -x^2e^{-x}+2xe^{-x}

To find zeros set f(x)=0  and solve for x

0 = -x^2e^{-x}+2xe^{-x}

0 = -e^{-x}(x^2-2x)

now factor out x

0 = -xe^{-x}(x-2)

set each factor =0 and solve for x

x=0

-e^{-x}=0 no solution for x

x-2=0, x=2

zeros of f  are 0 and 2

7 0
4 years ago
This is 23 points please help me or i’m gonna fail
Sergeeva-Olga [200]

Answer:

A

Step-by-step explanation:

5 0
4 years ago
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