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4 years ago

2x^2-5x=-1 use quadratic formula to solve equation and simplify answer completely

1 answer:

3 0

x =(5-√17)/4= 0.219
(2x2 - 5x) - -1 = 0
2x2 - 5x + 1 = 0
x2-(5/2)x+(1/2) = 0
x2-(5/2)x = -1/2

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Nora measured the angles of a triangle. Two of the angles measured 20° What was the measure of the third angle of Nora’s triangl

aivan3 [116]

Answer:

140°

Step-by-step explanation:

The sum of angle of a triangle is equal to 180°.

Two of the angles measured 20°.

We need to find the measure of the third angle of Nora’s triangle. let the third angle is x. So,

20+20+x = 180

40+x = 180

x = 180-40

x = 140°

So, the third angle of the triangle is 140°.

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3 years ago

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3 years ago

A number is selected from the set (1, 2, 3, 5, 15, 21, 29, 38, 500). If equal elemental probabilities are assigned, what is

Katen [24]

Answer:

$\frac{7}{9}$ OR 77.78%

Step-by-step explanation:

So, we first need to find out how many numbers fit the "less than 29 or odd" group.

This would be: 1, 2, 3, 5, 15, 21, and 29, which is a total of 7 numbers.

Next, we figure out the total amount of numbers in the population.

This would be: 1, 2, 3, 5, 15, 21, 29, 38, and 500, which is a total of 9 numbers.

Finally, we put the first number (7) over the total (9) = $\frac{7}{9}$

$\frac{7}{9}$ is now able to be written in a percentage, if you need.

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4 years ago

-45=5y I need the answer

slamgirl [31]

Answer:

-9 = y

Step-by-step explanation:

-45=5y

Divide each side by 5 to isolate y

-45/5=5y/5

-9 = y

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3 years ago

Read 2 more answers

A toaster that normally sells for $25 is on sale for 45% off.

Gnesinka [82]

Answer:

$13.25

Step-by-step explanation:

Change 45% in a decimal which is 0.45.
Multiply 0.45 and 25.
That will give you $11.25.
Change 8% into a decimal which is 0.08.
Multiply 0.08 and 25.
That will give you $2.
Then add $11.25 and $2.
Your final answer is $13.25

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3 years ago