What value of x makes 3x+7=22

3x = 22-7

3x= 15

x= 15/3

x=5

x=5

Step-by-step explanation:

3x+7=22

subtract 7 from both sides

3x=22-7

3x=15

divide both sides by 3

3x/3 = 15/3

x=5

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.