Xét tính chẵn lẻ của các hàm số
a) y=⌊x⌋
b) y=(x+2)^2
c) y=x^3+
d) y=x^2 + x + 1

Cam bought some used books for $4.95. he paid $0.50 each for some books and $0.35 each for the others. he bought fewer than 8 books at each price. how many books did cam buy?

Ivan and jeff buy a package of 8 pens for $4.00. ivan wants 5 of the pens, and jeff wants 3.how much should each student pay?

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c