Hii this is geometry please help!!

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.