Leah incorrectly added the fractions } + Ź + 12
She said that to add fractions with different denominators, you use the
common denominator and add the numerators. Leah's work is shown.
2/3 + 1 2 + 2
2 +1 +5
12
12
What is Leah's mistake, what should she have done, and what is the correct
answer? Show your work.
8
12

Aschool allots ? 1500 to spend on a trip to the theatre. theatre tickets have a regular cost of ? 55 each and are on offer for 1 5 off. a train ticket for the day will cost ? 12 each. if 2 teachers and the maximum number of students attend, how much money will the school have left over?

Ascientist places 24 cells in a petri dish. she knows the cells grow at an exponential rate, doubling in number every hour. how long will it take (in hours) for there to be 1100 cells in the dish? time to 1100 cells: 5.51832530 hours how long will it take to reach 110 cells? time to 110 cells : 2.1963972 hours what is the average rate of change in the number of cells between 9 hours and 11 hours? average rate of change: cells per hour what is the instantaneous rate of change after 7 hours? instantaneous rate of change: cells per hour note: you can earn partial credit on this problem.

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =