14 days
.25 x 4days = $1.00
0.30x 10 days = $3.00
$3 + $1 = $4
Direct variation means their ratio is a constant
x/y is 9/45=1/5
so when x=2, y=5*2=10
Answer:
wait writing on a piece of paper
A relation are two sets of elements noted as input and output. Within relations, the input and the output have something in common.
A function is also about input and output but in a function, the input has nothing in common with the output.