Answer this question?

b = -10

<M = 90

<N = 50

<O =  40

Step-by-step explanation:

The sum of the angles of a triangle add to 180

<M + <N + <O = 180

90 + -3b+20  + -3b +10 = 180

Combine like terms

120 -6b = 180

Subtract 120 from each side

120-120 -6b = 180-120

-6b = 60

Divide by -6

-6b/-6 = 60/-6

b = -10

<M = 90

<N = -3b +20 = -3(-10) +20 = 30+20 = 50

<O = -3b +10 = -3(-10)+10 = 30+10 = 40

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.