If a ∝ b and a = 18 when b = 3, then find a when b = 5.

Mathematics

1 answer:

Elden [556K]2 years ago

4 0

"a ∝ b" means "a is proportional to b", which in turn means there is some constant k such that

a = kb

We're given that a = 18 and b = 3, so that

18 = 3k ⇒ k = 6

Then when b = 5, we would have

a = 6 × 5 = 30

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Step 1: Rewrite equations

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Step 2: Changing the second equation

With substitution, you have to already have the equation to solve for the specific variable (ex: x=y+1;y=x+1). Since the equation doesn’t give us one, we can flip the second equation to give us this.

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This is your answer! Hope this helps comment below for more questions :)

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3 years ago

Read 2 more answers

Help help help helpppp

lord [1]

Answer:

39.7

Step-by-step explanation:

first must calculate the length of AB and BC

AB = 16.43

CB= 12.216

then perimeter : Perimeter of a triangle = sum of all three sides