Which mixture of gases is thought to have made up earth's early atmosphere?
a. methane, oxygen, hydrogen, water vapor
b. carbon dioxide, nitrogen, oxygen, ozone
c. hydrogen, water vapor, ammonia, methane, carbon dioxide
d. ozone, water vapor, carbon dioxide, ammonia

Simplify 6sin θsec θ. choices a) 6 tan θ b) 6 cos θ c) 6 cot θ d) 6

Scott harris can invest $7,000 in a 1-year cd that earns interest at an annual rate of 4 percent compounded monthly. the amount per $1.00 is 1.040742. he can also invest $7,000 in a 1-year cd at annual rate of 4 percent compounded quarterly. the amount per $1.00 is 1.040604. what is the difference in the amount of interest earned for each investment? a) $0.96 b) $0.81 c) $0.87 d) $0.88

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?