Which function is the inverse of f(x)=50,000(0.8)^x?

a. f^-1(x)=log0.8(x/20,000)
b. f^-1(x)=log50,000(x/0.8)
c. f^-1(x)=log0.8(50,000/x)
d. f^-1(x)=log0.8(x/50,000)

p. s. there's more points if you answer this same question. i posted it three days ago.

Combine like terms7y^2 + 7(6y^2 − 8)

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .