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tester [92]
3 years ago
11

Justin has only nickels and quarters in his piggy bank he’s 49 coins total for combined value of $8.85 how many of each type of

coin does he have
Mathematics
1 answer:
Pavlova-9 [17]3 years ago
8 0
17 nickels and 32 quarter.

Here's my work!

x = nickels
y = quarters

x + y = 49

.05x + .25y = 8.85

x + y = 49. = y= -x + 49

.05x +.25( -x + 49 ) = 8.85
.05x + -.25x + 12.25 = 8.85
-.2x + 12.25 = 8.85
- 12.25. -12.25

-.2x = -3.4
÷-.2x. ÷-.2x
x=17

x + y = 49
17 + y = 49
-17. -17

y=32

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3 years ago
Use the intercepts from the graph below to determine the equation of the function.
quester [9]

<u>ANSWER</u>

C) 4x-3y=-12

<u>EXPLANATION</u>

The intercept form of a straight line is given by:

\frac{x}{x - intercept}  +  \frac{y}{y - intercept}  = 1

From the the x-intercept is -3 and the y-intercept is 4.

This is because each box is one unit each.

We substitute the intercepts to get:

\frac{x}{ - 3}  +  \frac{y}{4}  = 1

We now multiply through by -12 to get

- 12 \times \frac{x}{ - 3}  +  - 12 \times  \frac{y}{4}  = 1 \times  - 12

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The correct choice is C.

4 0
3 years ago
Stuck! Help please!!
devlian [24]
<h3>Answer:  x = -1</h3>

Explanation:

The given quadratic is in the form y = ax^2 + bx + c

We have a = 1, b = 2, c = 2

This then leads to

h = -b/(2a)

h = -2/(2*1)

h = -1

This is the x coordinate of the vertex (h,k)

The axis of symmetry is the vertical line passing through the vertex. So it must share the x value in question.

Meaning the axis of symmetry is x = -1. Every point on this vertical line has an x coordinate of -1. This line of symmetry splits the parabola into two equal mirrored halves.

I recommend using a graphing tool like Desmos to visually confirm the answer.

6 0
2 years ago
the price for internet on the phone at least $9 a month with starting November the price will be 11.34 what is the % increase​
Murljashka [212]

Answer:   26%

Step-by-step explanation:

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8 0
3 years ago
Which reason is incorrect?
Tanzania [10]
The last one is incorrect. The correct answer is division. They divided 9 on both sides.
8 0
3 years ago
Read 2 more answers
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