Can someone help me with this plz

x = 5 ft

RS = 5 ft

ST = 9 ft

RT = 7 ft

Step-by-step 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

Step-by-step 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

step-by-step explanation:

$11.01

$16

$15

$4

hope this

starting with:    

5 + x - 12 = 2x - 7   

5 + x - 12 - x = 2x - 7 - x (subtract x from both sides)   

5 - 12 = x - 7 (combine and cancel x's from both sides)   

5 - 12 + 7 = x - 7 + 7 (add 7 to both sides)   

0 = x (add numbers together on both sides)       

so in order for the equation to be true, x must be 0.   

trying x = -0.5   

5 + x - 12 = 2x - 7 (original equation)   

5 + -0.5 - 12 = 2(-0.5) - 7 (plug in value of x)   

5 + -0.5 - 12 = -1 - 7 (did multiplication)   

-7.5 = -8 (did addition on both sides)       

since -7.5 is obviously not equal to -8, the value of -0.5 for x is wrong.   

trying x = 0   

5 + x - 12 = 2x - 7 (original equation)   

5 + 0 - 12 = 2(0) - 7 (plug in value of x)   

5 + 0 - 12 = 0 - 7 (did multiplication)   

-7 = -7 (did addition on both sides)       

since -7 equals -7, that demonstrates that the value of 0 for x is correct.   

trying x = 1   

5 + x - 12 = 2x - 7 (original equation)   

5 + 1 - 12 = 2(1) - 7 (plug in value of x)   

5 + 1 - 12 = 2 - 7 (did multiplication)   

-6 = -5 (did addition on both sides)       

since -6 is obviously not equal to -5, the value of 1 for x is wrong.