Can you help me with questions 1 2 4 and 5 please and show work I’ll give you brainliest

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

2. using calculations based on a perpetual inventory system, determine the inventory balance altira would report in its august 31, 2021, balance sheet and the cost of goods sold it would report in its august 2021 income statement using the average cost method. (round "average cost per unit" to 2 decimal places.)

Which statement best describes how to determine whether f(x) = x squared- x +8 is an even function ?