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3 years ago

A collection of 108 coins containing only quarters and nickels is worth $21 wich value could replace q on the chart?

Mathematics

2 answers:

Greeley [361]3 years ago

5 0

Answer:

There would be 30 nickels and 78 quarters.

Step-by-step explanation:

To find this, start by creating a system of equations in which x is the number of nickels and y is the number of quarters. Make the first equation the total number of coins.

x + y = 108

Make the second equation based on the value.

.05x + .25y = 21

Now multiply the second equation by -4 and add together to get the y value to cancel.

x + y = 108

-.2x - y = -84

--------------------

.8x = 24

x = 30

Now use this value to find y.

x + y = 108

30 + y = 108

y = 78

Makovka662 [10]3 years ago

5 0

Answer:

There would be 30 nickels and 78 quarters.

Step-by-step explanation:

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3 years ago

Which function is a quadratic function? y – 3x2 = 3(x2 + 5) + 1 y2 – 7x = 2(x2 + 6) + 7 y – 2x2 = 6(x3 + 5) – 4 y – 5x = 4(x + 5

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Answer:

Option A.

Step-by-step explanation:

The general form of a quadratic function is

$y=ax^2+bx+c$

It means, power of y should be 1 and highest power of x should be 2.

In option A,

$y-3x^2=3(x^2+5)+1$

$y-3x^2=3x^2+15+1$

$y=3x^2+16+3x^2$

$y=6x^2+16$

It is a quadratic function.

In option B,

$y^2-7x=2(x^2+6)+7$

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In option C,

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Here, highest power of x is 3. So, it is not be a quadratic function.

In option D,

$y-5x=4(x+5)+9$

Here, highest power of x is 1. So, it is not be a quadratic function.

Therefore, the correct option is A.

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3 years ago

Please Help!!! I really Need it! Please let me know if I am right for part A... I need help for part B too!

vlabodo [156]

You are correct for part A, good job! :D

As for part B, I <em>believe</em> the answers are function, nonlinear, and discrete.

Please let me know if I was wrong at any time. I hope this helps!!

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azamat

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