㏑(x²+2x) có tập xác định là gì

Diane owes $387 to her brother. if she debits her bank account $161.25 a month to pay him back, how many months will it take her to pay off the debt?

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.