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Natali5045456 [20]
3 years ago
15

Solve x^2-8x-9=0 algebrically

Mathematics
1 answer:
Svetach [21]3 years ago
3 0

Answer:

x=9   x=-1

Step-by-step explanation:

x^2-8x-9=0

Factor

What 2 numbers multiply to -9 and add to -8

(x-9) (x+1) =0

Using the zero product property

x-9 =0   x+1 =0

x=9   x=-1

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Answer:

8

Step-by-step explanation:

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PLEASE ANSWER ASAP FOR BRAINLIEST!!!!!!!
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Which stem-and-leaf plot has a median of 3.2<br><br><br><br> page.2
DiKsa [7]
Find the median of each set:-

Median is middle number of a data set. If a data set has an odd number of numbers then the median is the middle number when ordered form least to greatest but if its an even number you have to find the mean for the middle 2 numbers when ordered for least to greatest. 

A.

1.2, 2.4, 3.2, 3.2, 3.6, 4.0, 4.1, 4.7

Even numbers = 8
3.2 + 3.6 = 6.8
6.8 ÷ 2 = 
Median = 3.4
So this shows that A isn't the answer because the median of A is 3.4, not 3.2. 

B.

1.6, 2.8, 2.9, 3.1, 3.3, 3.6, 4.2, 4.5

Even numbers = 8
3.1 + 3.3 = 6.4
6.4 ÷ 2 = 3.2
Median = 3.2
<span>So this shows that B is the answer because the median of B is 3.2.

C. 

1.8, 2.0, 2.0, 2.2, 3.2, 4.7, 4.8, 4.9
</span>
Even numbers = 8
2.2 + 3.2 = 5.4
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Median = 2.7
<span>So this shows that C isn't the answer because the median of C is 2.7, not 3.2.
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D. 

1.4, 1.7, 2.9, 3.0, 3.1, 3.2, 3.2, 3.2, 4
Odd numbers = 9
Median = 3.1

<span>So this shows that D isn't the answer because the median of D is 3.1, not 3.2.
</span>
The stem and leaf plot which median is 3.2 is B.
5 0
2 years ago
Write the first five terms of the sequence.<br><br> a_(n) = -1(1)/(3)^(n-1)
Annette [7]
That's a little messy :)

If that is: -1/[3^(n-1)]

-1, -1/3, -1/9, -1/27, -1/81


4 0
3 years ago
On Monday Godswill ate some grapes. On Tuesday he
garri49 [273]

Answer: He ate 8 grapes on Monday.

Step-by-step explanation:

Let be "x" the number of grapes Godswill ate on Monday.

You know that he ate 6 more grapes than he had on Monday. This can be expressed with:

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Since each day that week, he ate 6 more grapes than the day before and he realized on Friday he had eaten a total of 100 grapes this week, you can write the following expression and solve for "x":

x+(x+6)+(x+12)+(x+18)+(x+24)=100\\\\5x+60=100\\\\x=\frac{40}{5}\\\\x=8

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