There are 810 letter tiles in a bag.
36
45
are vowels.
How many tiles are vowels?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =

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?