1. area is length * width so:
a = L * w
60 = L * 10
divide both sides by 10:
6 = L
2. perimeter is the total length of all sides added together
perimeter = side1 + side2 + side3 + side4
p = s1 + s2 + s3 + s4
a rectangle has only 2 different side lengths meaning s1 = s3 and s2 = s4. So so you can subsfuture s1 for s3 and s2 for s4:
p = s1 + s2 + s1 + s2
p = s1 + s1 + s2 + s2
s1 + s1 can be written as 2 * s1 and same for s2:
p = 2 * s1 + 2 * s2
We we know 1 side has length 8 and perimeter is 32. we can sub in values:
32 = 2 * s1 + 2 * 8
32 = 2 * s1 + 16
16 = 2 * s1
s1 = 8
3.well to cover the floor we needs it's its surface area.
area = length * width
we know length and width are 8 so
area = 8 * 8
area = 64
4. well to fence it I we only need perimeter. Just like in problem 2 we can say:
p = 2 * length + 2 * width
length and width are 8 and 10 so;
p = 2 * 10 + 2 * 8
p = 20 + 16
p = 36
5. a border is the same as a perimeter so this is like problems 2 and 4 so:
p = 2 * 9 + 2 * 9
p = 36
Now we want the cost and it is $1 per foot. so we can muLtiply the feet we need by cost per foot:
36ft * $1 = $36
6. the garden is 10 by 2 and we need area to cover the whole thing:
area = 10 * 2
area = 20 square feet
If if one bag covers 10 square feet then it will take 2 bags to cover the 20 square feet of her garden
