Answer: He bought 7 pens.
Step-by-step explanation:
21/3 = 7
Times both sides by -1
-8x=x²-20
add 8x both sides
0=x²+8x-20
factor
what 2 numbers multiply to get -20 and add to get 8
-2 and 10
0=(x-2)(x+10)
set to zero
x-2=0
x=2
x+10=0
x=-10
x intercepts at x=-10 and 2 or at the points
(-10,0) and (2,0)
The answer has something to do with volume.
Answer:
Step-by-step explanation:
According to the information provided his final score was -6 or six under par. Without knowing what par is a numerical value can’t be provided.
In -3,-1,0,3 is -3 and 3 pair of numbers has a sum of 0.
To find the possible pair of integers in each section, we apply the notion of integers. If it's possible, choose any two variables from a set of numbers and look for relationships between them.
Positive and negative counting numbers, as well as zero, make up integers. Think about each pair of integers or numbers whose sum will be zero. Discover this particular pair. There are numerous ways to obtain two integers whose total is zero. However, the number must match the opposing sign exactly.
Given numbers are -3,-1,0,3
From the given sum of the numbers, -3 and 3 are zero.
-3+3=0
To learn more about integers refer the link:
brainly.com/question/12399107
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