Carson buys three pencils at $0.35 each, a box of crayons for $2.86, four notebooks at $1.99 each, and two pens at $1.09 each. estimate the amount he spent on school supplies.

Find the value of a. the diagram is not to scale. a quadrilateral is drawn. the upper and lower sides are parallel. the interior angle in the upper left corner is labeled a degrees. the angle in the upper right corner is labeled 113 degrees. the angle in the lower right corner is labeled b degrees. the angle in the lower left corner is labeled 36 degrees. a. 36 b. 144 c. 54 d. 126

If i have one apple and give you the apple, how many apples do i have?

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years