Answer:
a) x + y
b) m x 7 or 7m
c) m x 3 or 3m
d) 
Step-by-step explanation:
a) the sum of x and y
- the sum most likely always means addition
b) the product of m and 7
- the product usually means multiplucation
c) the cost of 3 movie tickets at m dollars each
- so your getting 3 movie tickets at $m
the total would be m + m + m which is the same as mutiplying m by 3
d) 3 less than n, all divided by 4
- 3 less than n
less than usually means subtraction
than divided by 4
4 Oranges, 310 divided by 5= 64, 64 times 4=248.
180 is the lcm for 20 and 18
48 divided 12 equal 4 ⇒ 4 times of 12 to go to 48