PLZ HELP, GIVING BRAINLIEST
Prove that quadrilateral ABCD with the vertices A(2, 1), B(1, 3), C(-5, 0), and D(-4, -2) is a rectangle. (CHECK PIC BELOW)

Free 100 points to whoever says “oof the porridges” if it’s not exact, your answer will be reported, first person gets brainliest

Calculate the average rate of change over the interval [1, 3] for the following function. f(x)=4(5)^x a. -260 b. 260 c. 240 d. -240

Use the ratio test to determine whether ∑n=14∞n+2n! converges or diverges. (a) find the ratio of successive terms. write your answer as a fully simplified fraction. for n≥14, limn→∞∣∣∣an+1an∣∣∣=limn→∞.