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Nady [450]
3 years ago
7

7b = 4(b + 30) b=40, plug it in and show how you solved it

Mathematics
1 answer:
Colt1911 [192]3 years ago
8 0
7b=4(b+30)

Remove the parentheses

7b=4b+120

Move the variable to the left

7b-4b=120

Collect the terms

3b=120

Divide both side

Solution

b=40
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Solve 4e^2x-3=12 please help
Anestetic [448]

4*e^{2x} -3 = 12

Step 1:

Here we have -3 in subtraction on the left side, so when we take it to the right we apply opposite operation of subtraction that is addition.

4*e^{2x} = 12+3

4*e^{2x} = 15

Step 2:

Next we have 4 in multiplication on left side, so dividing right side by 4,

e^{2x} = 15/4

e^{2x} = 3.75

Step 3:

taking log on both sides

ln ( e^{2x}) = ln(3.75)

{2x} =ln 3.75

Step 4:

Dividing right side by 2,

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nikklg [1K]

Answer:

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(b) 17642.78546

Step-by-step explanation:

(a) There's a formula for this problem y = A(d)^t where, A is the initial value you are given, d is the growth or decay rate and t is the time period. So, in this case, as the car cost is decreasing it is a decay problem and we can write the formula as such; y = A(1-R)^t

So, in 5 years the car will be worth, 25500(1-4.5%)^5 or 20256.15625 dollars

(b) And after 8 years the car will be worth 25500(1-4.5%)^8 or 17642.78546 dollars.

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3 0
3 years ago
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marshall27 [118]
D≈6.37

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