carla has $90. she makes $6 per day walking a
neighbor's dog for half an hour, but spends $7.50
per day on lunch. what is the fewest number of
days for which carla will have less than $30?

4 days less than 30$

step-by-step explanation

since carla has 90$ and makes 6$ per day you divide 90 by 6 that gets you 15.

so she worked 15 days.

then since she spends 7.50 subtract on lunch everyday subtract 7.50 from 30 and you will have to do that 4 times. so for 4 days she will have less than 30$

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