Subtrack k from 7 then triple the result

Subtract k from 7: k-7

then triple the result: 3(k-7)

if you want to solve for k then

3(k-7)

=3k - 21

or 3k = 21

divide both sides by 3

3k/3 = 21/3

k =7

the expected value of the random variable : 0, 1 and 2

step-by-step explanation:

example 2 – simplify: step 1: completely factor both the numerators and denominators of all fractions. step 2: change the division sign to a multiplication sign and flip (or reciprocate) the fraction after the division sign; essential you need to multiply by the reciprocal. step 3 : cancel or reduce the fractions.