U2 D =
2a
u = 30.6 correct to 3 significant figures
a = 5.2 correct to 2 significant figures
a) Calculate the upper bound for the value of D.
Give your answer correct to 6 significant figures.

Jackson earns $25 per hour as a tutor at the college library. he set a weekly spending budget of $130 each week and puts the remaining money in his savings account. how many hours must he work this week to have at least an extra $50 to put in his savings account