(8z − 9)(8z + 9) = az2 − b what is the value of a?

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Find the area of a trapezoid with bases 14 cm and 18 cm and height 10 cm. 160 cm2 140 cm2 180 cm2 126 cm2

Kayla has a $500 budget for the school party.she paid $150 for the decorations.food will cost $5.50 per student. what inequality represents the number of students,s, that can attend the party?