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Mumz [18]
3 years ago
9

Eva is working two summer jobs, making $16 per hour tutoring and $8 per hour clearing tables. Last week Eva worked 3 times as ma

ny hours clearing tables as she worked hours tutoring hours and earned a total of $80. Graphically solve a system of equations in order to determine the number of hours Eva worked tutoring last week, x,x, and the number of hours Eva worked clearing tables last week, yy.
Mathematics
1 answer:
DanielleElmas [232]3 years ago
3 0

Answer:

48 and 32 6 hours clearing tables and 2 hours tutoring

Step-by-step explanation:

we can rewrite this as a fraction. we will use 1/10s because 80 can be divided by 8 which is in the problem. we then have to find out what two numbers add up to 8 but one is 3 times the other. 6 and 2 fit into this problem so we plug it into the equation and we write it as this 6x+4x=80 where x is 8. we get 48 and 32.

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4. Find the standard from of the equation of a hyperbola whose foci are (-1,2), (5,2) and its vertices are end points of the dia
Ad libitum [116K]

The <em>standard</em> form of the equation of the hyperbola that satisfies all conditions is (x - 2)²/4 - (y - 2)²/5 = 1 .

<h3>How to find the standard equation of a hyperbola</h3>

In this problem we must determine the equation of the hyperbola in its <em>standard</em> form from the coordinates of the foci and a <em>general</em> equation of a circle. Based on the location of the foci, we see that the axis of symmetry of the hyperbola is parallel to the x-axis. Besides, the center of the hyperbola is the midpoint of the line segment with the foci as endpoints:

(h, k) = 0.5 · (- 1, 2) + 0.5 · (5, 2)

(h, k) = (2, 2)

To determine whether it is possible that the vertices are endpoints of the diameter of the circle, we proceed to modify the <em>general</em> equation of the circle into its <em>standard</em> form.

If the vertices of the hyperbola are endpoints of the diameter of the circle, then the center of the circle must be the midpoint of the line segment. By algebra we find that:

x² + y² - 4 · x - 4 · y + 4= 0​

(x² - 4 · x + 4) + (y² - 4 · y + 4) = 4

(x - 2)² + (y - 2)² = 2²

The center of the circle is the midpoint of the line segment. Now we proceed to determine the vertices of the hyperbola:

V₁(x, y) = (0, 2), V₂(x, y) = (4, 2)

And the distance from the center to any of the vertices is 2 (<em>semi-major</em> distance, a) and the semi-minor distance is:

b = √(c² - a²)

b = √(3² - 2²)

b = √5

Therefore, the <em>standard</em> form of the equation of the hyperbola that satisfies all conditions is (x - 2)²/4 - (y - 2)²/5 = 1 .

To learn more on hyperbolae: brainly.com/question/27799190

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5 0
2 years ago
What is the scientific notation of 8,795,000
GuDViN [60]
Answer: 8.795 * 10^6 = 8,795,000

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

8.795 * 10 = 87.95

8.795 * 10^2 = 879.5

8.795 * 10^3 = 8,795

8.795 * 10^4 = 87,950

8.795 * 10^5 = 879,500

8.795 * 10^6 = 8,795,000
7 0
4 years ago
Read 2 more answers
Commission earned is 6% at a show store; original cost of shoes: $125
oksian1 [2.3K]

125 x .06 = 7.5

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5 0
4 years ago
If your grade was a 90% and you got a 63% what would your grade become
erica [24]

Answer:

I think it might become a 76.5%

Step-by-step explanation:

I'm really not sure, I just added them up and divided them by 2 to 76.5.

I really hope this helps!!

5 0
3 years ago
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How do i solve (x+3)^1/2=(3x+7)^1/4
deff fn [24]
Step 1: Cross-multiply.
(x+3)^1/2=(3x+7)^1/4
Step 2: Subtract 6x from both sides.
4x+12−6x=6x+14−6x
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Step 3: Subtract 12 from both sides.
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Step 4: Divide both sides by -2.
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Answer:
x=−1
6 0
3 years ago
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