Answer:
10 degrees
Step-by-step explanation:
For an equilateral triangle, all three angles add up to 180, meaning that each angle is 60 degrees. Knowing that, we can substitute that number in to solve for x.
5x + 10 = 60
5x = 50
x = 10
60 because equilateral triangle have 60-60-60 angles
but for step by step:
3 (5x+10)=180
15x+30=180
15x= 150
x=10
5x+10= 5(10)+10= 60
