Ben can type 25 words in half a minute. At this rate, how many words can he type in 5 minutes? A student found the unit rate and solved the problem. The student’s work is shown below. Has the student answered the question completely?

StartFraction 25 words over One-half minute EndFraction = StartFraction 50 words over 1 minute EndFraction
No, the student should have divided the unit rate by 5.
No, the student should have multiplied the unit rate by 10.
No, the student should have multiplied the unit rate by 5.
Yes, the student found how many words he can type in 5 minutes.

Peaches cost $4.29 per pound. find the cost of two and a quarter pounds of peaches.

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.

Awavelength of 610 nm was found to be the most intense wavelength emitted by copper. answer the following questions about this wavelength of light. a) what is this wavelength in cm? b) what is the frequency that corresponds to this wavelength? c) what is the energy of light of this wavelength? d) what is the wavenumber corresponding to this wavelength?