Can someone help me with these questions please

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

Aculinary club earns $1360 from a dinner service. they sold 45 adult meals and 80 student meals. an adult meal costs twice as much as a student meal. what is the cost of an adult meal?

What is the positive solution to the equation 0 = -x2 + 2x + 12quadratic formula: x = -b/b²-4ac0-2+5202-20 ite10-1+2