What’s the answer please i don’t need work shown :)

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Which of the following equations is of the parabola whose vertex is at (2, 3), axis of symmetry parallel to the y-axis and p = 4? a.)y-3 = 1/16 (x-2)^2 b.)y+3 = -1/16 (x+2)^2 c.)x-2 = 1/16 (y-3)^2