What is pi and can someone explain it because my head is so confused

Put this in order from greatest to least 0.012 0.100 0.001 0.101

Which represents a quadratic function? f (x) = - 8x3 - 16x2 - 4x f (x) = x 2 + 2x - 5 f (x) = + 1 f (x) = 0x2 - 9x + 7

Solve the inequality: - 1+4y < 31

Is 1/5 equivalent to 3/10

A metallurgist has one alloy containing 21% titanium and another containing 50% titanium. How many pounds of each alloy must he use to make 44 pounds of a third alloy containing 37% titanium? (Round to two decimal places if necessary.)

Dan had 175 dollars to spend on 6 books. After buying them he had 13 dollars. How much did each book cost?

Angle I measured 20 degrees, side HI = 5, angle L = 20 degrees, and side KL = 5. What additional information would you need to prove that triangle HIJ is congruent to triangle KLM by SAS

In the barn, there are horses and chickens. There are 11 heads and 32 legs altogether. How many chickens are there? A. 6 B. 5 C. 4 D. 3

What is 5.9 as a mixed number and a improper fraction?

9 x 1/4 = 2 1/4 what is the improper fraction