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Harman [31]
3 years ago
7

Leah would like to earn at least 150 per month. She babysits for $10 per hour and works at an ice cream shop for$12 per hour.Lea

h cannot work more than a total of 25 hours per month.Let x represent the number of hours leah babysits and let y represent the number of hours leah works at the ice cream shop

Mathematics
1 answer:
Firdavs [7]3 years ago
3 0

Answer:

The solution in the attached figure

Step-by-step explanation:

<u><em>The question is</em></u>

Write and solve a system of inequalities that models this situation

Let

x ---> represent the number of hours Leah babysits

y ---> represent the number of hours Leah works at the ice cream shop

we know that

<em>Leah would like to earn at least 150 per month</em>

The term "at least" means "greater than or equal to"

so

10x+12y\geq 150 ----> inequality A

The solution of the inequality A is the shaded area above the solid line 10x+12y= 150

The slope of the solid line A is negative m=-5/6

The y-intercept of the solid line A is (0,12.5)

The x-intercept of the solid line A is (15,0)

Leah cannot work more than a total of 25 hours per month

x+y\leq 25 ----> inequality B

The solution of the inequality B is the shaded area below the solid line B x+y=25  

The slope of the solid line B is negative m=-1

The y-intercept of the solid line B is (0,25)

The x-intercept of the solid line B is (25,0)

using a graphing tool

The solution of the system of inequalities is the shaded area above the solid line A and below the solid line B

see the attached figure

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The price the agant found is $1452,5.
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Ingrid dug a trench 18/20 of a meter long. The next day she dug 9/20 of a meter more of the trench. What is a reasonable estimat
lutik1710 [3]
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6 0
3 years ago
Is RS perpendicular to DF? Select Yes or No for each statement. R (6, −2), S (−1, 8), D (−1, 11), and F (11 ,4) R (1, 3), S (4,7
guajiro [1.7K]

I'll do the first one to get you started.  

Find the slope of the line between R (6,-2) and S (-1,8) to get

m = (y2-y1)/(x2-x1)

m = (8-(-2))/(-1-6)

m = (8+2)/(-1-6)

m = 10/(-7)

m = -10/7

The slope of line RS is -10/7

Next, we find the slope of line DF

m = (y2 - y1)/(x2 - x1)

m = (4-11)/(11-(-1))

m = (4-11)/(11+1)

m = -7/12

From here, we multiply the two slope values

(slope of RS)*(slope of DF) = (-10/7)*(-7/12)

(slope of RS)*(slope of DF) = (-10*(-7))/(7*12)

(slope of RS)*(slope of DF) = 10/12

(slope of RS)*(slope of DF) = 5/6

Because the result is not -1, this means we do not have perpendicular lines here. Any pair of perpendicular lines always has their slopes multiply to -1. This is assuming neither line is vertical.

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3 0
3 years ago
Transform the given quadratic function into vertex form f(x) = quadratic function into vertex form f(x) = quadratic function int
melisa1 [442]

Answer:

Vertex form: f(x) =(x +\frac{7}{2})^2 -\frac{53}{4}

The vertex is (-\frac{7}{2},-\frac{53}{4})

Step-by-step explanation:

For a general quadratic function the form is:

ax ^ 2 + bx + c

For the function

f(x) = x ^ 2+ 7x -1

The values of the coefficients for the function are the following: a = 1, b =7, c = -1

Take the value of b and divide it by 2. Then, the result obtained squares it.

\frac{b}{2}= \frac{7}{2}

(\frac{b}{2})^2=(\frac{7}{2})^2=\frac{49}{4}

Add and subtract \frac{49}{4}

f(x) = (x ^ 2 +7x +\frac{49}{4}) -\frac{49}{4}- 1

Write the expression of the form

f(x) = (x+\frac{b}{2})^2 +k

f(x) =(x +\frac{7}{2})^2 -\frac{53}{4}

The vertex is (-\frac{7}{2},-\frac{53}{4})

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