The average human heart beats 75 times every minute. If the heart rate drops to 60 times a minute, which integer below would represent the change? -25
-15
0
15

Find two rational expressions that have the difference of 2-n/n-4

Aregular hexagon rotates counterclockwise about its center. it turns through angles greater than 0° and less than or equal to 360°. at how many different angles will the hexagon map onto itself?

Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?