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3 years ago

Solve the following quadratic equation using the quadratic formula. −2y^2+5=7y

Mathematics

1 answer:

Vikki [24]3 years ago

3 0

Answer:

y=(7±√89)/-4

Step-by-step explanation:

y=(-b±√b^2 -4ac)/2a

Rewrite given equation in quadratic form so it is -2y-7y+5=0

Then, in formula, sub -2 for a, -7 for b, and 5 for c

y=-(-7)±√(-7)^2 -4(-2)(5)/2(-2)

When you multiply that out you get

7±√49-(-40)/-4

The next step is the answer given above

If you need the answer not in sq rt form, it is y=-4.1085 and y=0.0608

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Which of the following is not in scientific notation?

SSSSS [86.1K]

Answer:

I believe the answer would be 61.2 x 10^4

Step-by-step explanation:

61.2 > 10

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3 years ago

How to solve fractions with whole numbers?

Kryger [21]

Answer:

You can follow these steps to multiply a fraction by a whole number:

Write the whole number as a fraction with a denominator of 1.

Multiply the numerators.

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Step-by-step explanation:

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3 years ago

Read 2 more answers

Angelo brought apples and bananas at the fruit stand. He bought 20 pieces of fruit and spent $11.50 apples cost $.50 and bananas

Jlenok [28]

Angelo bought 14 apples and 6 bananas

Solution:

Let "a" be the number of apples bought

Let "b" be the number of bananas bought

Cost of 1 apple = $ 0.50

Cost of 1 banana = $ 0.75

He bought 20 pieces of fruit. Therefore,

number of apples bought + number of bananas bought = 20

a + b = 20 -------- eqn 1

He spent $ 11.50. Therefore, we frame a equation as:

number of apples x Cost of 1 apple + number of bananas x Cost of 1 banana = 11.50

$a \times 0.50 + b \times 0.75 = 11.50$

0.50a + 0.75b = 11.50 ------- eqn 2

Let us solve eqn 1 and eqn 2

From eqn 1,

a = 20 - b ------ eqn 3

Substitute eqn 3 in eqn 2

0.50(20 - b) + 0.75b = 11.50

10 - 0.5b + 0.75b = 11.50

0.25b = 11.50 - 10

0.25b = 1.5

Divide both sides of equation by 0.25

Substitute b = 6 in eqn 3

a = 20 - 6

Thus he bought 14 apples and 6 bananas

3 0

4 years ago

Lee filled up his gas tank before starting a road trip. If he used 5.8 gallons two hours into the trip, and has 12.4 gallons rem

Cloud [144]

The answer would be 18.2 gallons because they used up 5.8 gallons, they still have 12.4 gallons that they did not use and in order to get the original amount of gas they had before the trip, you would add up 12.4 and 5.8 to get the Original amount. Hope this helps.

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4 years ago

Find the exact value of tan 67.5° trig

nataly862011 [7]

Answer: 1 + $\sqrt{x} 2$

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3 years ago