How many different pairs of classmates can you choose from six classmates? 18 pairs
12 pairs
d. 9 pairs
b. 15 pairs
a.
c.

expression #3 is not equivalent. the others are.

no association

step-by-step explanation:

if you have eyes and you can use them efficiently you can see that it just looks like random dots like do a line of best fit and like they're so spread out it's such a weak association you might as well consider it nonexistent

a. 12.5 kg

step-by-step explanation:

f = ma

so

m = f/a = (2500 n)/(200 m/s²) = 12.5 kg

1 n = 1 kg·m/s²