Can you please help me on this question

D

Step-by-step explanation:

1/2 is half of his homework so half of 24 is 12. 3/4 of a hour is 45 minutes because 15 x 3 is 45 and 15 x 4 is 60 and there's 60 minutes in an hour. So he will complete all of his homework so 1 whole so it would be something greater than a whole so it's D. Because 2/2 equals a whole number.

B. 2/3

Step-by-step explanation:

If he completed 1/2 his homework that leaves him with 12 problems. So in 3/4 of an hour he can complete 12 problems. Then you need to find how many problems he can complete in 1/4 of an hour by doing 12/3 to get 4. So if he can solve 4 problems in 1/4, he can get 16 problems done in an hour. Make it a fraction- 16/24 and simplify it to 2/3.

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation:

a. 12.5 kg

step-by-step explanation:

f = ma

so

m = f/a = (2500 n)/(200 m/s²) = 12.5 kg

1 n = 1 kg·m/s²