Each day you run on a treadmill for “r” minutes and lift weights for 15 minutes. which expressions can you use to find how many minutes of exercise you do in 5 days?

a. 5(r+15)
b.5r+5•15
c.5r+15
d. r(5+15)

explain your reasoning:
a: they are both expressions with r as the variable

b: they are not equivalent expressions

c: they are equivalent expressions

d: both expressions contain the terms 5,r, and 15

This is different from the first one can someone me

Which of the following three dimensional figures has a circle as it’s base

In one day there are too high tides into low tides and equally spaced intervals the high tide is observed to be 6 feet above the average sea level after six hours passed a low tide occurs at 6 feet below the average sea level in this task you will model this occurrence using a trigonometric function by using x as a measurement of time assume the first high tide occurs at x=0. a. what are the independent and dependent variables? b. determine these key features of the function that models the tide: 1.amplitude 2.period 3.frequency 4.midline 5.vertical shift 6.phase shift c. create a trigonometric function that models the ocean tide for a period of 12 hours. d.what is the height of the tide after 93 hours?