Alyssa paid a plumber x dollars per hour for a 6-hour period, plus $70 for parts. the total charge was $172. what is the equation for how much money the plumber is charged per hour ?

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

What is the upper quartile in the box plot?

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0