To build a bookshelf, Tim needs to purchase 4 pieces of wood and $26 worth of shelving brackets. If he has a budget of $85, show an inequality that he could use to determine the
maximum price per unit, w, he can pay, for each piece of wood. Assume there is no sales tax.

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70

thats not a system of equations, that is a solution

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92