Answer:
m∠A=89
m∠B=67
m∠B=24
Step-by-step explanation:
Hello There!
First we want to find the value of x and remember all of the angles in a triangle add up to equal 180 so we can use this equation to solve for x
180 = 3x - 5 + 4x - 7 + x
step 1 combine like terms
3x + 4x + x = 8x
-5 - 7 = -12
now we have 180 = 8x - 12
step 2 add 12 to each side
180 + 12 = 192
-12 + 12 cancels out
now we have 192 = 8x
step 3 divide each side by
8x/8 =x
192/8=24
we're left with x = 24
Now we plug in x to each angle so we can find the measure
∠A = 4(24)-7
4*24=96
96-7=89
∠A = 89
∠B = 3(24)-4
3*24=72
72-4=69
∠B=69
∠C=x
∠C=24
