A radioactive isotope has a half-life of 13 hours. Find the amount of the isotope left from a 400-milligram sample after 52 hours. If necessary, round your answer to the nearest thousandth.

Simplify the expression -7 - 8y + 1 - 2y = ?

What would you have to do to make the line y = 2x - 7 steeper on the coordinate plane?

What is the value of 1 raised to a negative exponent?

A stretch of highway that is 12 1/4 kilometers long has speed limit signs every 7/8 of a kilometer. How many speed limit signs are on this stretch of highway?

How do you find the value of coefficients in the x to the cubed power?

F the first three numbers of a proportion are 19, 38, 11, find the fourth proportional is

Round 93.0129 to the nearest thousandth

a hot air balloon is 10 meters above the ground rising at a rate of 15 meters per minute. another hot air balloon is 150 meters above the ground and descending at a rate of 20 meters per minute.

The highest and lowest temperatures ever recorded in the united states are 134° at Death Valley, California, and - 80° aT prospect Creek, Alaska. What is the difference in these temperatures extremes?

The difference between 22 and x