If you doubled the radius of a sphere, how would the surface area change?

A.
The surface area would double.
B.
The surface area would be 1/2 of the original surface area.
C.
The surface area would quadruple.
D.
The surface area would not change, but the volume would.

Ataxi company charges $2.25 for the first mile and then $0.20 per mile for each additional mile, or f = $2.25 + $0.20(m - 1) where f is the fare and m is the number of miles. if juan's taxi fare was $6.05, how many miles did he travel in the taxi? if juan's taxi fare was 7.65, how many miles did he travel in taxi

Can any one me with the answers to these questions asap?

Summary statistics given for independent simple random samples from two populations. use the pooled t-interval procedure to obtain specified confidence interval. x1=71.6, s1=3.9, n1=11, x2=67.9, s2=3.4, n2=9 determine a 99% confidence level.