Jenna bought books for $3 each and a game for $5. She spent a total of $26. How many books did she buy? 1.) What operation goes with the word each? Addition, subtraction, multiplication, or division?
2.) What operation goes with the word and? Addition, subtraction, multiplication, or division?
3.) Write a equation
4.) Solve for b (which is the variable for books)
Please and thank you!!!

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?