Hailey invited 6 friends to his backyard barbeque. the next day, each of those friends sent a
text to 6 other friends to come to the barbeque. this pattern continued for three days.
expressed in a power, how many people were invited in all?

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

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 function f(x)= -(x+5)(x+1) is down. what is the range of the function?