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charle [14.2K]
3 years ago
8

$5 PAYPAL + BRAINLIEST TO ANSWER THS

Mathematics
1 answer:
expeople1 [14]3 years ago
5 0

Answer:

Quadratic Equation:

3x^2=2x +5

\text{Standard Form: } 3x^2-2x-5=0

From the standard form of a Quadratic Function, we get:

a=3,\:b=-2,\:c=-5

Discriminant:

\Delta=\left(-2\right)^2-4\cdot \:3\left(-5\right)

\Delta=\left(-2\right)^2+4\cdot \:3\cdot \:5

\Delta=64

From the discriminant, we conclude that the equation will have two real solutions.

State that:

b^2-4ac

b^2-4ac =0:\text{The equation has 1 real solution}

b^2-4ac >0:\text{The equation has 2 real solutions}

By the way, solving the equation given:

$x=\frac{2\pm\sqrt{64}}{2\cdot \:3}$

$x=\frac{2\pm\sqrt{64}}{6}$

$x=\frac{2\pm8}{6}$

$x_{1} =\frac{10}{6}=\frac{5}{3}  $

$x_{2}=\frac{-6}{6} =-1$

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kyle has a total of 16 coins in his pocket. all the coins are nickels or quarters, and they have a total value of $2.20. how man
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Answer:

The number of nickels are 9.

Step-by-step explanation:

Let us assume that the number of the nickels be n.

Let us assume that the number of the quarters be q.

As given

kyle has a total of 16 coins in his pocket.

Than the equation becomes

n + q = 16

As given

They have a total value of $2.20.

As

1 nickel = 0.05 dollars

1 quarters = 0.25 dollars

Than the equation becomes

0.05n + 0.25q = 2.20

As simplify the above

5n + 25q = 220

Than the equation becomes

n + q = 16 and 5n + 25q = 220

Multiply n + q = 16 by 5 and subtracted from 5n + 25q = 220 .

5n - 5n + 25q - 5q = 220 - 80

20q = 140

q = \frac{140}{20}

q = 7

Put in the equation n + q = 16 .

n + 7 = 16

n =  16 - 7

n = 9

Therefore the number of nickels are 9.


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