URGENT, WILL GIVE BRAINLIEST!!
7. 9-(5-7y) =13+4y
12. 5(3m+4) =3(4m+7)
14. 5(a+2)-3(3a-5)=1
17. 5(v+2)+3(v-5)=19
19. 2=5(5z-2)-9(3z-2)

If the value of cos330°is√3/2 then find cos 165°.

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?

The measures of the angles in △abc are given by the expressions in the table. angle measure angle a 65° angle b (3x−10)° angle c (2x)∘ find the value of x. then find the m∠b and m∠c.