How do you access the math tutor on for free? Sometimes it says it costs money and then a couple weeks later it's free again. How do I make it become free whenever it tries to charge? I'm on Android phone.

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a seven or king. (b) compute the probability of randomly selecting a seven or king or jack. (c) compute the probability of randomly selecting a queen or spade.

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)-144x+360 what am i doing wrong?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?