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gregori [183]
3 years ago
8

Express the interval using inequality notation. [9,0)​

Mathematics
1 answer:
kherson [118]3 years ago
4 0

Answer:

0

Step-by-step explanation:

The bracket on the 9 means that you can include 9. There is a parentheses on the 0, so we don't include it.

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13....................
Mashcka [7]

13.

(a)

y=-5x^2+21x-3

for x = 2:

y=-5(2)^2+21(2)-3=-20+42-3=19

for x = 5

y=-5(5)^2+21(5)-3=-125+105-3=-23

(b)

The graph is:

(c)

Using the graph:

\begin{gathered} x=1.8,y=18.6 \\ x=0.548,y=7 \\ x=3.65,y=7 \end{gathered}\begin{gathered} x=1.8 \\ y=-5(1.8)^2+21(1.8)-3=-16.2+37.8-3=18.6 \end{gathered}\begin{gathered} y=7 \\ -5x^2+21x-3=7 \\ -5x^2+21x-10=0 \end{gathered}

Using the quadratic formula:

\begin{gathered} x=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a} \\ x=\frac{-21\pm\sqrt[]{21^2-4(-5)(-10)}}{2(-5)} \\ x=\frac{-21\pm\sqrt[]{241}}{-10} \\ x=0.54758 \\ or \\ x=3.6524 \end{gathered}

6 0
1 year ago
Using excel, answer the following questions. Write down the Excel formulas used at each step.1. General Junkfoods has collected
tiny-mole [99]

Answer:

See explanation

Step-by-step explanation:

Required

The average weight produced

The question is incomplete, as the required cells are not given and there are other missing details.

However, I will give a general explanation of calculating average in Excel

The required formula is:

=AVERAGE(Cell Range)

Assume the cells that contain the boxes are: cells A10 to A10010

The average will be calculated as:

=AVERAGE(A10:A10010)

6 0
3 years ago
Common numbers for 15 18 and 12
Aleks [24]
<span>Common numbers for 15 18 and 12: 1 and 3</span>
8 0
3 years ago
What is 5/7 in the simplest form
Alexeev081 [22]
Exact form: 
5/7

Decimal form:
0.71428571... 


3 0
3 years ago
Which is a factor of 20x2 + 40x + 15?<br><br> 4x + 1<br> 4x + 3<br> 2x + 3<br> x + 2
maksim [4K]
C)
2x + 3
3 0
4 years ago
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