How do I solve x^2-9=0

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Add the fractions and simplify 1/2+ 1/3

With this question substitute t=3 and t=5 to determine if the two expressions are equivalent. 4(t + 3) 4t+12 which statements are true? check all that apply. a. the value of both expressions when t =5 is 32. b. the two expressions are not equivalent. c. the value of both expressions when t=3 is 15. d. the value of both expressions when t=5 is 23. e. the two expressions are equivalent. f. the value of both expressions when t=3 is 24.