The department of public safety has an old memo stating that the number of accidents per week at a hazardous intersection varies according to a normal distribution, with a mean of 2.2 and a standard deviation of 1.4. department officials implemented a new safety plan, heavier police patrols and new signs, to see if they could reduce the average number of accidents at this intersection. they recorded the number of accidents per week for 52 weeks. they find that the average over that period was two accidents per week. what is the p ‑value for the test of h 0 : μ = 2.2 against h a : μ < 2.2 ?

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?

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?

Right ∆abc has coordinates a(-7, 3), b( -7, 10), and c(-1, 3). the triangle is reflected over the x - axis and then reflected again over the y - axis to create ∆a'b'c'. which are the coordinates of vertex a'?