Evaluate and show your steps.
a. 3.8 × 0.5 + 1.5 × 30

Start out with writing it

3.8 x 0.5+ 1.5 x 30

Multiply the numbers: 3.8 x 0.5 = 1.9

=1.9+30 x 1.5

Multiply  the numbers: 1.5 x 30= 45

=1.9 +45

Add the numbers: 1.9 + 45=46.9

=46.9

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).