What is the result of substituting for y in the bottom equation?
y=x+3
y=x^2+2x-4

A x+3=x^2
B x+3=x^2+2x-4
C y=(x+3)^2+2(x+3)-4
D y=x^2+2x-4-(x+3)

Ineed solving this problem h/8=-25 solve for h idk how to this can someone show me and also give an answer you

The rows and columns of lattice points in a three-by-three square array are evenly spaced one unit apart. how many distinct triangles with at least one side of length 2 units can be drawn using three lattice points for the vertices?

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.