Which explanation best describes how to solve this problem?

tanya used 170 gold stars and 140 silver stars to decorate 10 cards. she put the same number of stars on each card.

how many stars did tanya put on each card?

a.
add 170 and 140 together and subtract 10.

b.
add 170 and 140 together and divide by 10.

c.
divide 170 by 10 and add 140.

d.
divide 140 by 10 and add 170.

Harold wrote this equation to model the level of water in a pool over time. the variable x represents time in hours. f(x) = 3,500 - 225x which statements about the situation are true? check all that apply. the water level is rising. the water level is falling. the initial level of water in the pool was 3,500 units. the initial level of water in the pool was 225 units. the pool was empty after 14 hours. the water was 2,600 units high after 4 hours.