Question

Solve for BC:


A. 18
B. 27
C. 7
D. 30​

Answer 1

C. 7

Explanation:

Pic is blurry but just set the expressions equation to each other and solve. All sides are the same length.

Answer 2

D) BC = 30

Explanation:

this is an equilateral triangle, meaning all sides have the same value

therefore it is mathematically correct to write this equation:

4x + 2 = 5x - 5

subtract 2 from each side to get:

4x = 5x - 7

subtract '5x' from each side to get:

-x = -7

divide or multiply each side by -1 to get:

x = 7

Substitute 7 in for 'x' in the expression: 4x + 2 to solve for BC:

4(7)+2 = 30

Check that 'x' = 7:

4(7)+2 should equal 5(7)-5

28+2 = 35-5

30 = 30