Answer:
31.4
Step-by-step explanation:
So a really easy way to solve this is as goes
--> 3.14 x (20 x 1/2)
--> 3.14 x (10)
Now multipling by 10 is just moving the deciaml place one spot to the right
=> thus, we get 31.4
Hope this helps!
Answer:
510
Step-by-step explanation:
(0.68)750
shift decimal places
510.00
refine:510
Answer:
9
Step-by-step explanation:
substituting 2 for the x
y = 2(2) + 5
y = 4 + 5
y = 9
Using the cosine double angle formula,
(Note I took the positive case since 
terminates in the first quadrant)
Using the Pythagorean identity,
(Note I took the positive case since terminates in the first quadrant)
