Estimate to the nearest hour, the most common number of hours of sleep required by a mammal.

7-8

Step-by-step explanation:

As humans are mammals, we require around 8-12 hours of sleep, this means that most other mammals may require the same amount of sleep. According to the provided chart, 9 is the average, and between 6-7 hours are the most common.

22 and 22

step-by-step explanation:

10 plus 12 equals 22.

12 plus 10 also equals 22 because regardless of what order they're in, they're gonna equal the same thing.

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116