Question

Can someone help me with this plz​

Answer 1

Explanation:

The perimeter of a triangle is calculated by adding all three side lengths together

That means x + 4 + x + x + 2 = 21 ft add the like terms

3x + 6 = 21 ft subtract 6 from both sides

3x = 15

x = 5

RS = x ➡ 5

ST = 4 + x ➡ 9

RT = x + 2 ➡ 7

Answer 2

x = 5 ft

RS = 5 ft

ST = 9 ft

RT = 7 ft

Explanation:

Perimeter is the sum of all sides.

(x+2) + (4+x) + (x) = 21

3x + 6 = 21

3x = 21 - 6 = 15

3x = 15

x = 15/3 = 5

RS = x = 5

ST = 4 + x = 4 + 5 = 9

RT = x + 2 = 5 + 2 = 7