One batch of pink paint uses 2 cups of red paint and 7 cups of white paint. Mai made a large batch of pink paint using 21 cups of white paint. How many cups of red paint did she use?

3

Step-by-step explanation:

because 1 pink batch uses 2 cups of red paint =1+2 =3

and 7 cups of whit paints

and we know that she used a large batch of pink paint using 21 cups of white paints .Therefore she used 3 cups of red paints.

Because =7×3=21

option c) graph of line going through 1, 4 and 3, 10

step-by-step explanation:

let y equal to margo's coin collection

let x equal to number of years

at the begining x=0, y=1 → point=(x,y)→point=(0,1)

she adds 3 coins per year, then y=1+3x

at x=1, y=1+3(1)=1+3→y=4→point=(x,y)→point=(1,4)

at x=3, y=1+3(3)=1+9→y=10→point=(x,y)→point=(3,10)

the graph of line going through (1, 4) and (3, 10), then the option c is the correct.