Answer:
Brenda ran 263.76 metres.
Step-by-step explanation:
The circumference of a circle is two times pi times its radius. Brenda rand that twice, so we need:
2 × 2πr
= 4πr
= 4 × 3.14 × 21m
= 263.73m
Answer:
164/7 in decimals
Step-by-step explanation:
2x-3+5x-13
7x=164
x=164/7
use your calculator to find the 164/7
Answer:
4/5
Step-by-step explanation:
16/20 in a simpler form is 8/10. 8/10 in the simplest form is 4/5 (division)
There are an infinite number of solutions, so I don't plan to list them all.
I'll list two of them, and then describe how to get all of the rest.
You said that <u>2cos(x) - 1 = 0</u>
Add 1 to each side: 2cos(x) = 1
Divide each side by 2: cos(x) = 1/2
The angles whose cosine is 1/2 are 60 degrees, 300 degrees,
and any multiple of 360 degrees added to either of those.