Evaluate the expression `3b-ac` when `a\ =\ 2`, `b\ =3`, and `c=-1.5`.
12
-5
-15
24
To evaluate the expression `3b - ac`, substitute the given values for `a`, `b`, and `c`:
`3(3) - (2)(-1.5)`
Simplifying,
`9 + 3`
`= 12`
Therefore, when `a = 2`, `b = 3`, and `c = -1.5`, the expression `3b - ac` evaluates to `12`.
Which expression best represents the following statement?
The difference of 15 and twice a number `n`.
The expression that best represents the statement "The difference of 15 and twice a number `n`" is:
`15 - 2n`