Exponents and Exponential Functions Unit Test someone PLEASE oh PL explain to me all of the answers cuz i just can't think straight, plus, mathematics are literally making mah brain go "FLOP"

H -(10)^-1
A. -1/10
B. -1/-1^10
C. 1/10
D. 10

(-7.4)^0

A. -1
B. -7.4
C. 0
D. 1

-1/a^-2
A. -a2
B. -2/a
C. -2a
D. a^2

5^4 x 5^7

A. 125^11
B. 15^11
C. 5^28
D. 5^11

Simplify this expression:

(3)^10 (3)^-9

A. 3
B. 1/3
C. 9^-90
D. 9

(t^8)^2

A. 2t^16
B. t^10
C. t^16
D. t^64

(5t^3)^-4

A. 625/t^12
B. 20/t^7
C. 1/625t^12
D. 1/20t^7

(ok i'm sorry if i don't write the rest of the questions/options, it's just my back is hurting from leaning to long and my fingers hurt for typing to long and my brain is burning up because of how many numbers and letters there are in this test)

(IF YOU KNOW THE REST OF THE QUESTIONS AND OPTIONS PLEASE WRITE IT ALONG IN YOUR ANSWER!!! I NEED IT ASAP OR ELSE I'M GETTING AN F- IN MY GRADE ._.)

Can someone answer this question for me

An annual marathon covers a route that has a distance of approximately 26 miles. winning times for this marathon are all over 2 hours. the following data are the minutes over 2 hours for the winning male runners over two periods of 20 years each. earlier period 14 12 15 22 13 10 19 13 9 14 20 18 16 20 23 12 18 17 6 13 recent period 7 11 7 14 8 9 11 14 8 7 9 8 7 9 9 9 9 8 10 8 (a) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the earlier period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks. for more details, view how to split a stem.) minutes beyond 2 hours earlier period 0 1 2 (b) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the recent period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks.) minutes beyond 2 hours recent period (c) compare the two distributions. how many times under 15 minutes are in each distribution

Agrid shows the positions of a subway stop and your house. the subway stop is located at (-5,2) and your house is located at (-9,9). what is the distance, to the nearest unit, between your house and the subway stop?