Q85. - Algebra 2

Question

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

 $1.5c-7$

Step-by-Step Solution

Answer

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

Step 1 - 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.

Step 2 - Substitute given values

Substitute 1.8 for c into given expression 

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

Step 3 - Simplify 1 . 5 1 . 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,  $1.5c-7=-4.3$