Suppose A and B are sets such that A∪B has 20 elements, A∩B has 7 elements and the number of elements in B is twice that of A. what is the number of elements in A? and B?​

Which statement is true about a number and its additive inverse? a. their product is always one. b. their sum is always one. c. they are always reciprocals of each other. d. their sum is always zero.

G. how many different 6-letter arrangements can be formed using the letters in the word absent, if each letter is used only once? a. 6 b. 36 c. 720 d. 46,656

Write as a product of two polynomials. 2(3–b)+5(b–3)^2