A line that passes through (1,8) and is perpendicular to the graph of y=2x+1. What equation represents the line in slope-intercept form?

Which expression is the factorization of x^2+10+21

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Emily convinced her mom to buy a giant box of her favorite cereal. her mom doesn't think the box will fit on their shelf. the volume of the box is 1000 cm^3 . the base of the box is 25 cm by 10 cm