40 pts! a rocket accelerates straight up from rest with a constant acceleration of 400 m/s^2. how long will it take the rocket to reach an altitude of 20,000 meters? this problem can be represented using the following equation. (1/2)400t^2=20,00

a. 20 seconds
b.) 10 seconds
c.) 12 seconds
d. 7 seconds

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.

Can someone, me with this.i really need with this