Use euler's formula to find the missing number. vertices: 15 edges: 24 faces: ? a. 9 b.10 c.11 d.12

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?

Y+ 2/y is it a polynomial in one variable or not? and if so, why?

Which of these side lengths could form a triangle a) 2 cm , 2 cm , 4 cm b) 3 cm , 5 cm , 10 cm c) 3 cm , 4 cm , 5 cm d) 4 cm , 8 cm , 15 cm