PLEASE HELP I NEED THIS DONE ASAP! ILL MAKE BRAINLIST

Solve the following equations:

i) 7x + 8 = -90
ii) 5y - 4 = 2y - 25
iii) 4 (p + 3) = 36
iv) 2 (4f + 3) = 3 (2f + 6)

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?