So for this trinomial, I will be factoring by grouping. Firstly, what two terms have a product of 16x^2 and a sum of 10x? That would be 8x and 2x. Replace 10x with 2x + 8x:

Next, factor x^2 + 2x and 8x + 16 separately. Make sure that they have the same quantity inside the parentheses: 
<u>Now you can rewrite this as
, which is your final answer.</u>
26x3=78
78-x=72
x=6
She needs to buy at least 6 more to have enough for 26 students
21 3/16...as a decimal
the 21 is a whole number and goes to the left of the decimal....and the fraction 3/16 goes to the right of the decimal.
3/16 = 0.1875....now add ur 21 and u get 21.1875 inches wide
2 3/8....as a decimal
3/8 = 0.375....now put ur 2 in there and it becomes 2.375 inches thick
Answer:
k=2
Step-by-step explanation:
7(k+8)=70
We move all terms to the left:
7(k+8)-(70)=0
We multiply parentheses
7k+56-70=0
We add all the numbers together, and all the variables
7k-14=0
We move all terms containing k to the left, all other terms to the right
7k=14
k=14/7
k=2