Since it went 8 floors in 6 seconds you divide. 8/6 is 1.333 or 1 1/3 floors per second. Hope this helps.
Answer:
=(x-3)(x+7)
Step-by-step explanation:
To factor the trimonial:
, we follow these steps:
Step 1: Multiply the first and last term
![-21 \times x^2=-21x^2](https://tex.z-dn.net/?f=-21%20%5Ctimes%20x%5E2%3D-21x%5E2)
Step 2: List out product factors of the term derived above
![-21=-1 \times 21\\ -21=-3 \times 7\\-21=3 \times -7\\-21=1 \times -21](https://tex.z-dn.net/?f=-21%3D-1%20%5Ctimes%2021%5C%5C%20-21%3D-3%20%5Ctimes%207%5C%5C-21%3D3%20%5Ctimes%20-7%5C%5C-21%3D1%20%5Ctimes%20-21)
Step 3: Determine which of the factors sum up to the middle term 4x
The required product is: -3 and 7
Therefore: -3x+7x=4x
Step 4: Replace the middle term by the expression derived in step 3 and factorize.
![x^2+ 7x -3x- 21\\=x(x+7)-3(x+7)\\=(x-3)(x+7)](https://tex.z-dn.net/?f=x%5E2%2B%207x%20-3x-%2021%5C%5C%3Dx%28x%2B7%29-3%28x%2B7%29%5C%5C%3D%28x-3%29%28x%2B7%29)
15a-25=35
3.333
Leah needs to buy some apples from the grocery store. She places fifteen apples in her cart and proceeds to the checkout. Lucky for her, there happens to be a discount on apples for the day. She saves $25 on her purchase. The total money she ends up spending was only $35 (excluding tax). How much did each apple cost?