Katie knew that 70 + 70 = 140. Explain how she can use this double to solve 70 + 80.

7.41*10^ (4) in standard notation.

Which quantity is proportional to 18⁄6? Tell me all that is true. 36⁄12 90⁄18 72⁄24 54⁄6 3⁄1

Find the greatest two consecutive odd intergers whose sum is less than 85

AB = 3 + x DC = 4x AD = y + 1 BC = 2y Quadrilateral ABCD is a parallelogram if both pairs of opposite sides are congruent. Show that quadrilateral ABCD is a parallelogram by finding the lengths of the opposite side pairs.

Multiply (x-3) (4x+2)

A 5 ounce can of tuna cost $.90 a 12 ounce can of tuna cost $2.40 which is the better bye

Solve equation 2 (x+4) = - 5x + 1 show each step

To choose a sample for a survey of seventh graders, the student council puts pieces of paper with the names of all the seventh graders in a bag and selects 20 names. Is it ransom sample or a biased sample. Explain.

The radius of a basketball is 4.7 inches what is the volume of the basketball round to the nearest ten

1) 3x^2 + 4x + 5x^2 - 5y 2) (4x - 2y) - (2x + 5y) 3) 3x^3 (4x^2) 4) 5 x cubed y to the fourth z all divided by 10 x y squared z cubed 5) (-8a^3b^4) ^2 6) (x + 6) (x - 6) 7) (2x - 7) ^2 8) (2x + 5) (3x - 7) 9) 5 x cubed y plus x y to the fourth plus