What is the value of b^2 - 4ac for the following equation?

2x^2 - 2x - 1 = 0

a. -4
b. 0
c. 12

When you arrive at the lake, your friend realises he hasn’t got any swimming trunks. you need to ride to a sports shop. the sports shop is 8350 metres away. how many metres is it to cycle there and back?

Correct answer brainliest asap an d 99 pointsss what are relative frequencies to the nearest hundredth of the columns of two way table column a 102, 18 colunm b 34, 14 answers choices 0.15 0.25 0.29 0.44 0.56 0.71 0.75 0.85

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.