Question

Evaluate each expression if $a=2,b=-\frac{3}{4},$and $c=1.8$.

$1.5c-7$

Short answer

Expression $1.5c-7$ results into $-4.3$

Step-by-step solution

- Order for simplification 

To evaluate any expression involving more than one operation, follow the below order of operations:

• First evaluate expressions inside grouping symbols like parentheses ( ) or brackets [ ].
• Evaluate the exponents.
• Perform Multiplication and division from left to right.
• Perform addition and subtraction from left to right.

- Substitute given values

Substitute 1.8 for c into given expression

$1.5c-7=1.5\left(1.8\right)-7$

- Simplify 1.51.8-7

To evaluate, firstly perform multiplication and finally subtraction from left to right to get

$\begin{array}{c}1.5\left(1.8\right)-7=2.7-7\\ =-4.3\end{array}$

Thus, $1.5c-7=-4.3$