There are 13 students in the third grade and twice that number in the fourth grade. there are 15 boys and 10 girls in the second grade.
how many students are in grades 2 through 4 altogether?

The figure below shows rectangle abcd and the triangle eca on a coordinate plane. which of the following expressions represents the perimeter of triangle of triangle eca in units

Which statements describe the solutions to the inequality x< -20 check all that apply. there are infinite solutions. each solution is negative. each solution is positive. the solutions are both positive and negative. the solutions contain only integer values. the solutions contain rational number values.

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²