Percents
1.
martha estimated there were 95 marbles in a jar for a contest. the actual number of marbles in the jar was 117. what was the percent error of martha's estimation?
22%
81.20%
23.16%
18.80%

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.

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?