Geometry
The interior angle of a pentagon.
What is 108?
Find the solutions of the quadratic x^2+5x+6=0
What is -2 and -3?
Find how many edges a polyhedron has with 12 faces, 20 vertices.
What is 30?
360 workers need 20 hours to make 5 houses. How many more workers are needed to make 5 houses in 15 hours?
Two triangles are similar. One triangle has side lengths 13 inches, 14 inches, and 15 inches. The other triangle has 26 inches, 28 inches, and 30 inches. Find the ratio of the area of the larger triangle to the smaller triangle.
What is 4:1?
What is -1
Find the inradius of a circle inscribed in a triangle with side lengths of 6, 8, and 10.
What is 2?
Find the sum of the roots of the cubic x^3+8x+24x+120=0
What is -8?
Find the smallest possible surface area of a rectangular prism with volume 512.
Let a cubic be x^3+7x^2+22x+9=0. Let the roots be a,b,c. Find 1/(ab)+1/(bc)+1/(ac).
What is 7/9?