Question

Which expression represents the algebraic phrase “the sum of negative three-eighths and four times x minus nine times z”?

Negative 9 z (Negative StartFraction 3 over 8 EndFraction + 4 x)

Negative StartFraction 3 over 8 EndFraction (4 x minus 9 z)

Negative StartFraction 3 over 8 EndFraction + 4 x minus 9 z

Negative StartFraction 3 over 8 EndFraction minus 4 x + 9 z

Answer 1

-3/8+4x-9z

Step-by-step explanation:

The sum of -3/8 means -3/8+ some number, which we find out (later in the expression) to be 4×x (that is 4 times x), or 4x. So we add on 4x to the expression, which becomes -3/8+4x. Then, it says "minus 9 times z so we just take away 9xz. So, the final expression is -3/8+4x-9z