A U. S. one dollar coin is made of copper, zinc, manganese, and nickel in the following ratio: 44: 3:2:1. Its mass is 8 grams. How many grams of each element are in a one dollar coin?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.