1. 100 increased by 99%
2. 75 decreased by 80%

1. 199  

2. 15

Step-by-step explanation:

1. To increase a number by a certain amount, you multiply the number by 0.99 and add it to the original number:

100(0.99)=99

100+99= 199

2. To decrease a number by a certain amount, you can multiply the number by 0.80 then subtract it from the original number:

75(0.80)= 60

75-60= 15

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.