Question

four questions and I have no idea what am doing

9. Evaluate the following expression when a = 2 and b = 5.
(2 • a)b-1

10. Evaluate the following expression when a = 3 and b = -2.
7ab


11. If the mass of a proton is 2.53 x 10-37 gram, what is the mass of 1,000 protons?



12. What is the order of the mass of electrons from least to greatest?
12.4 x 10-3, 14 x 102, 0.013 x 103, and 157 x 10-4

Answer 1

9) Plug in 2 and 5 instead of a and b:
(2* 2)*5-1

Answer 2

10) Again, plug in 3 instead of a, and -2 instead of b:
7*3*(-2)

Answer 3

11) If one is 2.53 x 10-37 grams:
1 * p = p = 2.53 x 10-37 grams
What is:
1,000 * p = 1,000 * 2.53 x 10-37 grams ?

Answer 4

\[12.4 * 10^{-3}\]\[14*10^2\]\[0.013*10^3\]\[157*10^{-4}\]
Which one of these numbers is the smallest, which one's the 2nd smallest, etc.?

Answer 5

0.013 x 10^3 ?

Answer 6

\[12.4*10^{-3}=0.0124\]\[14*10^2=1,400\]\[0.013*10^3=13\]\[157*10^{-4}=0.0157\]

Answer 7

thank you soo much
ur awesome and am sry for being a bit slow

Answer 8

np

Answer 9

and that's all the info that I need right

Answer 10

yea, now just put those numbers in the right order, smallest to largest