How many zeros does the function f(x) = 7x13 − 12x9 + 16x5 − 23x + 42 have?

Aladder that is 30 ft long needs to reach 27 ft up a building. what should the angle of the vertical be?

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number tt of tokens james has is a function of gg, the number of games he plays

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?