Which expression shows the distance on the number line between 2 and -7?
o 12+(-7)
0 12
71
o
2 - (-7)
o 1–7+21

Ineed if you could explain and give me the answer you! this needs done

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?

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry