The answer is 4, 20,100, 500
Answer:

Step-by-step explanation:
we know that
Depending on your calculator, you enter the degree and then press the trig button or the other way around. Also, make sure the mode of your calculator is in DEGREES
we have

see the attached figure to better understand the problem
Answer:
9
Step-by-step explanation:
In order to round to the nearest ten you must think: what is the nearest multiple of 10. For example, to round 68 to the nearest 10, the nearest whole number is 70, so the answer would be 70. However if you were to round 63 to the nearest 10, to would be 50 since that is the nearest multiple of 10
Answer:
15
Step-by-step explanation:
using the formula a= based x height the answer would be 15