Kate is allowed to work no more than 20 hours a week. she has already worked 13 hours this week. at most, how many more hours can she work? write an inequality and solve.
a) x + 13 ≤ 20; x ≤ 7
b) x + 13 ≥ 20; x ≥ 7
c) x + 13 < 20; x < 7
d) x + 13 > 20; x > 7