Andre received $60 for his birthday and put it in his piggy bank. each week, he puts 3 more dollars in his bank. the amount of money in dollars d in his bank is given by d = 3w + 60 where w is the number of weeks he has saved 3 dollars. his sister lana makes a table of reasonable values for w. lana selects 42 as a value for w. what is the corresponding table entry for d?
(teacher hint: they are asking what d will be if w is 42.)
a.54
b.105
c.186
d. 402
i don't get algebra at all

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)