Aclass contributed $3.50 in nickels and dimes to the red cross. in all there were 45 coins. how many were there of each kind

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Ineed your ! i was to turn this into pond first thing i gotta do is outline the inside with this plastic how big should i cut the plastic the height: 10 1/2” the length: 40” the width: 12” me !

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?