Answer:
The associative property states that you can add or multiply regardless of how the numbers are grouped. By 'grouped' we mean 'how you use parenthesis'. In other words, if you are adding or multiplying it does not matter where you put the parenthesis. Add some parenthesis any where you like!.
The Commutative property states that order does not matter. Multiplication and addition are commutative.
hope this helps please mark brainliest!
Answer:
351.48cm²
Step-by-step explanation:
Heron’s Formula
Find half the perimeter (30+30+26)/2=43
It’s the square root of each side subtracted from 43, multiplied together, times 43.
√(43-30)*(43-30)*(43-26)*43=√13*13*17*43=√=123539=351.481cm²
They share 1/10 of a pound each person
A- Perpendicular lines have negative reciprocal slopes. Therefore a perpendicular line to 2x-8 will have a slope of -1/2. Once solved in slope intercept form, choice A shows a line of slope -2/4, equivalent to -1/2
We have to find out the number of trees planted per unit rate of time.
Kyla can plant 300 trees in 1 hour, so she can plant 300 trees in 3600 seconds. This implies that she can plant
![\dfrac{300}{3600}=\dfrac{1}{12}](https://tex.z-dn.net/?f=%5Cdfrac%7B300%7D%7B3600%7D%3D%5Cdfrac%7B1%7D%7B12%7D)
trees per second.
On the other hand, Mia can plant 1 tree in 13 seconds, so she can plant
![\dfrac{1}{13}](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B13%7D)
trees per second.
Working together they can plant
![\dfrac{1}{12}+\dfrac{1}{13}=\dfrac{25}{156}](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B12%7D%2B%5Cdfrac%7B1%7D%7B13%7D%3D%5Cdfrac%7B25%7D%7B156%7D)
trees per second, i.e. it takes them 156/25 seconds to plant a tree.
We conclude that they plany 100 trees in
![\dfrac{156}{25}\cdot 100=156\cdot 4=624](https://tex.z-dn.net/?f=%5Cdfrac%7B156%7D%7B25%7D%5Ccdot%20100%3D156%5Ccdot%204%3D624)
seconds