What value of n makes the equation true? (2x^9 y^n) (4x^2 y^10) = 8x^11 y^20

1. 7.2 aliens = 1 monster. 1 monster = 15.5 oranges. Using the conversion above, about how many oranges are equal to 1 alien? 2. In a scaled drawing, 1 millimeter represents 150 meters.

What number must be added to 51 to get a sum of 0?

If $ (a_1, a_2,/ldots, a_{17}) $ satisfy / begin{align*} a_1 + a_2 + a_3 & = 1, / / a_2 + a_3 + a_4 & = 2, / / a_3 + a_4 + a_5 & = 3, / / & ~~/vdots / / a_{15} + a_{16} + a_{17} & = 15, / / a_{16} + a_{17} + a_{1} &

Write an equation of the circle with center (-8,4) and diameter 6.

Find the population density round to the nearest tenth

consider the expression x^2-b. What has to be true about the values of b for this expression to be factorable?

G. o is going on a hike in the mountains on a hot summer day. He has 4/5 gallon of water that he split into 4 bottles. What fraction of a gallon is in each bottle

Courtney has $4.95 in nickels, quarters, and dimes. She has12 quarters and 9 nickels. How many more dimes than nickels does she have? A. 15 B. 10 C. 6 D. 4

0 is greater than or equal to 7n

What is 22/8 as a mixed number?