Aschool bus has 25 seats, with 5 rows of 5 seats. 15 students from the first grade and 5 students from the second grade travel in the bus. how many ways can the students be seated if all of the second-grade students occupy the first row?

25p20
5p5 × 20p15
5c5 × 25c14
5p5 × 15p15
5p5 × 25c15

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

Adecibel is a logarithmic unit that can be used to measure the intensity of a sound. the function y = 10logx gives the intensity of a sound in decibels, where x is the ratio of the intensity of the sound to a reference intensity. the reference intensity is generally set at the threshold of hearing. use the graphing utility to graph the decibel function.a whisper has a sound intensity of 30 decibels. use your graph to you complete the following statement. the sound intensity of a whisper is times the reference intensity.

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2