Raisins sell for $3.50 per pound, and granola sells for $5.90 per pound. terri bought some raisins and some granola. the total weight was 2.1 pounds and cost $8.79. let r represent the number of pounds of raisins terri purchased. which expression represents the number of pounds of granola she purchased? a. 2.1 – r b. 2.1r c. r + 2.1 d. r – 2.1

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have