The wind is blowing at 10 knots. sailboat racers look for a sailing angle to the 10-knot wind that produces maximum sailing speed. this situation is now represented by the polar graph in the figure shown below. each point (r, θ) on the graph gives the sailing speed, r, in knots, at an angle θ to the 10-knot wind. what is the speed to the nearest knot, of the sailboat sailing at 120° angle to the wind?
a. 9 knots
b. 7 knots
c. 8 knots
d. 10 knots

In priyas math class there are 10 boys and 15 girls. what is the ratio of boys to girls in priyas math class? express your answer as a decimal

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?

Simplify the algebraic expression 8y-2(y+4)