Answer:
1st one
Step-by-step explanation:
it is just rearranged
Remember that when there is no sign in front of the first one, there is an invisible plus/positive sign
Answer:
8190 ways
Step-by-step explanation:
Given


Selection


Required
Number of ways of selection
4 students can be selected from 15 students in:

Similarly.
5 teachers can be selected from 6 teachers in:

So, the required number of selection is:

Apply combination formula:







No because the box has a fixed weight as the several books weighing said pounds would most likely to be use as the x in this equation.
There is no rate of change of Function 1. It's slope(rate of change) is zero.
Function 2 has a slope of 2.