Answer:
5 seconds
Step-by-step explanation:
The ground is 25 eet, so 25=-16t^2+400
-16t^2=-400, 16t^2=400
t^2=25, dividing both sides by 16
t=5 seconds.
Answer: 17
21-4=17
4+17=21
21+17=38 and so on..
Answer:
9r
Step-by-step explanation:
1.5r - 3r + 10.5r
10.5r + 1.5r = 12r
12r - 3r = 9r
Final Answer = 9r
I know you're using Khan Academy, anyway the answer is 135 mate.
50 girls attended the trip. ( 80 boy + 50 girls = 130 total students) You just multiply both by 10.
