Christopher has breakfast at a cafe and the cost of his meal is $36.00 because of the service, he wants to leave a 10%, percent tip. what is his total bill including tip?

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?

Find the area of a parallelogram with the given vertices. p(-2, -5), q(9, -5), r(1, 5), s(12, 5)

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?