Question

question 20
6 pts
the distance between the crest (highest point) of a wave and trough (lowest point) of a wave can be calculated by subtracting the trough from the crest. if the crest is 18 and the trough is -2, what is the distance?

question 21
6 pts

Explanation:

Step1: Set up subtraction

We need to subtract the value of the trough from the value of the crest. The formula is $crest - trough$.
$18-(- 2)$

Step2: Simplify the subtraction

Subtracting a negative number is the same as adding its positive counterpart. So $18-(-2)=18 + 2$.
$18+2 = 20$

Answer:

20