Answer:
1) a:6p+11 b:18-2r c:0.3+21d d:2/3a+4
2) a:3a b:5s c:2e+10 d:4y+10
3) a:t x 3 b: 3 x b +12 c: 11 x z -1.5 d:14 - 13 x r
4)Pamela is correct
Explanation:
1)instead of a multipliction symbol between a variable and a constant number, you combine them. The constant comes first and the variable comes after. (When you have the value of the variable and want to insert it into the expression, you can put parentheses instead of a multpilication symbol.)
2)You can combine the variables. Since multiplication is another form of addition, instead of adding the variable 5 times (for example) you can multiply it by 5.
3) This is the opposite of question 1. Instead of shortening the expression you must expand it for it to have a multiplication symbol.
4)Pamela is correct. You must find the peremiter of a square, which has all equal sides. Since there are 4 sides, it is easier to multiply the 6mm side by 4 sides for a perimeter of 24. Sean calculated incorrectly and Sue added the amount of sides with the side lenght (instead of multiplying)
