How many of each coin does he have?

_nickels

_quarters

100 Nickels

300 Quarters

Step-by-step explanation:

Let's see...

Derek has a total of 400 coins, and if there is 3 times the number of quarters than nickels, that means that we can split the value so that nickels * 3 = quarters. That means that if there are 100 nickels, 100 * 3 = 300 Quarters. Adding it together: 300 Quarters + 100 Nickels = 400 Coins!

Hurray!

Next time tell Derek to do it himself, he's so lazy -_-.

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.