Ikeep messing this up for #13 i got (1/19, 35/38) and for #15 i got (2,-1) both of which i know are wrong, someone me understand what i did wrong?

Which function has the smallest y-intercept value

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

If square root x = -7, then x= -49 true or false