Which variable expression matches the word phrase "4 less than 2 times a number"
a. 4 - 2x
b. 2x - 4
c. 4x - 2

2x - 4

Step-by-step explanation:

a number = x

x is being multiplied to 2

4 is being subtracted from 2 times x

Multiplication is first.

2x - 4

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.

2(2x + 3) = -4 + 2(2x + 5)

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 6

4x - 6 + 6 = 4x - 6 + 6

4x = 4x

x = x

unlimited solutions.