Gavin starts with x marbles. If Gavin gives 3 of his marbles to Cindy, then Cindy will have twice as many marbles as Gavin has after the exchange. If y is the number of marbles that Cindy has after the exchange, which of the following equations is true? A) y=2(x +3)
B) y=2(x + 1)
C) y=2(x - 1)
D) y=2(x - 3)

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?

Select the correct answer. what is the exact value of sin (157.5°)? a. 'sqrt(2 - sqrt(2))/2 b. *"-"'sqrt(2 + sqrt(2))/29 c.'sqrt(2 + sqrt(2))/4" d. "-"sqrt(2 + sqrt(2))/4)