Answer:

Step-by-step explanation:
Given

Required
Find 
To find
, we simply substitute 10 for d and -4 for c in the given expression.
The step is as follows:

Substitute 




The expression cannot be solved any further; so, we can conclude that when d = 10 and c = -4, 
Answer:
true
Step-by-step explanation:
Answer:
120
Step-by-step explanation:
15 x 2 x 4 = 120
Answer:
4:11
Step-by-step explanation:
let's say there 15 students, 10 of them study a language. Of the 10, 4 (the 2/5) study french, so of the 15 students 4 study french, making it 4:11.