Answer :
Answer:
Let's simplify each expression step by step:
**(a) 120 x (-15) + 120 x 5**
First, calculate each multiplication:
\[ 120 \times (-15) = -1800 \]
\[ 120 \times 5 = 600 \]
Now, add these results together:
\[ -1800 + 600 = -1200 \]
So, \( 120 \times (-15) + 120 \times 5 = -1200 \).
**(b) 215 x 53 - 15 x 53**
Here, we have a common factor in each term:
\[ 215 \times 53 - 15 \times 53 \]
Factor out \( 53 \):
\[ (215 - 15) \times 53 \]
Calculate inside the parentheses:
\[ 215 - 15 = 200 \]
Now multiply:
\[ 200 \times 53 \]
Calculate this multiplication:
\[ 200 \times 53 = 10600 \]
Therefore, \( 215 \times 53 - 15 \times 53 = 10600 \).
So, the simplified expressions are:
(a) \( -1200 \)
(b) \( 10600 \)