Help plz ill give extra points

The measure of DAC is 15 degrees.

Step-by-step explanation:

Since there are three angles that make up this 90 degree angle. we need to find the missing angle from the other two. To do this, subtract the known angles from 90 degrees.

The measure of the missing angle is 15 degrees.

ALGEBRA METHOD:

You can also use a variable to find the missing measurement.

The measure of the angle, x, is equal to 15 degrees.

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.