Answer:
78
Step-by-step explanation:
(-5)•(-5) + 3•21= 25+ 63= 78
The only numbers that go into 125 and 560 evenly are 1 and 5
Answer: 1050
Step-by-step explanation:
Number of combinations of selecting r things out of n = 
such that 
Given: A restaurant menu has 5 kinds of soups, 7kinds of main courses, 6 kinds of desserts, and 5 kinds of drinks.
If a customer randomly selects one item from each of these four categories, then by fundamental counting principle , the number of different outcomes are possible = 
hence, total number of outcomes = 1050
Do "42 + 12" Since 7 x 6 is 42 and 4 x 3 is 12.