Please help me with this problem , and please please show your work , I’ll give you brainlist

Step-by-step explanation:

x+(x+2)+(6x+10)= 180⁰(sum of angles in a triangle)

Open the brackets by +1

x+x+2+6x+10. =. 180⁰

2x+6x+10+2. =. 180⁰

8x+12. =. 180⁰

8x. =. 180⁰-12⁰

8x. =. 168

x. =. 168/8

x. =. 21

x+2=2+21=23

6x+10=6×21+10=126+10=136

A+B+C=180⁰

21⁰+23⁰+136⁰=180⁰

180⁰ =180⁰

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step-by-step explanation:

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.