Answer:
9 + 10 = 21
Step-by-step explanation:
Factor out 9 and 10
9 = 3 · 3 10 = 2 · 5
Next multiply 3 by 2
3 × 2 = 6
Then multiply 3 by 5
3 · 5 = 15
Finally add the products
15 + 6 = 21
quotient is divide
-20/4 = -5
-5 -3 = -8
