Question

What should be measured to calculate the average rate at which the water in a cup cools?

Answer 1

Change in mass of water and time in which the mass changes

Change in weight of water and time in which the weight changes

Change in volume of water and time in which the volume changes

Change in temperature of water and time in which the temperature changes

Answer 2

@undeadknight26

Answer 3

its the last choice... change in temperature over time

Answer 4

prove it :)

Answer 5

ok... so what is the question asking you to find?

and it appears that each choice is over a time period...

Answer 6

Ok ill trust you :)
can you help me with another one?

Answer 7

An inequality is shown below:

-np - 6 ≤ 3(c - 5)

Which of the following solves for n?

Answer 8

No wait i cant do answer choices because they are equations

Answer 9

-np - 6 ≤ 3(c - 5)
-np - 6 ≤ 3c - 15
-np ≤ 3c - 9
I can get that far :)

Answer 10

well it becomes

-np - 6 <= 3c - 15

add 6 to both sides

-np <= 3c - 9

divide by -p and reverse the inequality

n >= -3(c -3)/p

Answer 11

oh wow thats almost what I did :)

Answer 12

let me try writing the answer choices :)
n ≥ - the quantity 3 times c minus 21 all over p

n ≥ - the quantity 3 times c minus 9 all over p

Answer 13

ooooor....

n ≥ -(3c - 21)/p
n ≥ -(3c - 9)/p

Answer 14

@campbell_st

Answer 15

the other two are not it because they are the same just the ≥ is the other way :)

Answer 16

well it looks like the 2nd choice

n >= -(3c - 9)/p

Answer 17

oooh... cuz you miswrote the 9 for a 3 :P

Answer 18

no.. I factored the 3..