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3 years ago

Help! 10 Points not 5!

Mathematics

1 answer:

KATRIN_1 [288]3 years ago

6 0

9514 1404 393

Answer:

Step-by-step explanation:

Solve the first for a, then substitute into the second.

a = 27/(5b^2)

Then ...

(27/(5b^2))^2·b = 135

27^2/(5^2·135) = b^3 = 27/125

b = ∛(27/125) = 3/5

a = 27/(5(3/5)^2) = 15

The expression of interest is ...

a +5b = 15 + 5(3/5) = 15 +3

a +5b = 18

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Given:
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Probability of another boy being chosen: 1/3

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A college some completed some courses worth 3 credits and some courses worth 4 credits. The students earned a total of 59 credit

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The student completed 13 courses with 3 credit hours.

Step-by-step explanation:

Total credit hours = 59 credits hours

Total courses = 18

Let,

3 credit hours courses = x

4 credit hours courses = y

According to statement;

x+y=18 Eqn 1

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Multiplying Eqn 1 by 3

$3(x+y=18)\\3x+3y=54\ \ \ Eqn\ 3$

Subtracting Eqn 3 from Eqn 2

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Putting y=5 in Eqn 1

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The student completed 13 courses with 3 credit hours.

Keywords: linear equation, elimination method

Learn more about linear equations at:

#LearnwithBrainly

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