Find the measure of ∠a if

∠a = 3/2x + 20
∠b = 7/2x + 20
∠c = 5/2x + 40
∠d = 3/2x + 10

a) 55°
b) 65°
c) 76°
d) 104°

Step-by-step explanation:

(32x+20) + (72x+20) + (52x+40) + (32x+10)=180 \\ 32x+72x+52x+32x +20+20+40+10 =180 \\ 188x+90=180 \\ -90  \\ 188x=90 \\ /188 \\ x=0.478


then 52(0.478)+40 \\ 24.856+40=64.856


C=64.856

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

answer: c

because if you look at the chart you can see a pattern and compare it to the question he simplify out your

but i think the formula is f(x)=6x