A sphere has a diameter of 8 cm. Which statements about the sphere are true? Select two choices. Recall the formula S A = 4 pi r squared.
The sphere has a radius of 4 cm.
The sphere has a radius of 16 cm.
The surface area of the sphere is 32 pi centimeters squared.
The surface area of the sphere is 64 pi centimeters squared.
The surface area of the sphere is 256 pi centimeters squared.

The perimeter of a triangle is 69 cm. the first is 5 cm shorter than the second side. the third side is twice as long the first side. find the length of each side

The focus of parabola is (-4, -5), and its directrix is y= -1. fill in the missing terms and signs in parabolas equation in standard form

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.