a square poster board has sides that are 40 inches long when the triangular flaps at the sides are opened the poster board takes the shape of the trapezoid the base of each triangle is 24 inches what is the area of the trapezoid poster board?

4+6x-3x^3 in standard form with explanations because i don’t understand

Find the required measurements of the following trapezoids. a = 8 cm b = 16 cm h = 10 cm

Cassie is traveling 675 miles today to visit her brother and his family. so far, she has stopped for gas three times. at the first stop, she put in 7.1 gallons of gas and paid $23.79. at her second stop, she put in 5.8 gallons of gas and paid $19.08. and, at the third stop, 6.6 gallons and paid $20.39. at which stop did casey pay the most for gas?