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4 years ago

Help plz i need this done asap

Mathematics

1 answer:

jok3333 [9.3K]4 years ago

6 0

To find the percent change of something you need to set up a proportion.

amount change (original - new) over new number

x over 100

then cross multiply. Example

25 x
----- ------
50 100

25 x 100 = 2500
2500/50 = 50

So the answer is 50%

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Steven earns extra money babysitting he charges $33 for 4 hours and $57.75 for 7 hours entering an equation to represent the rel

sweet [91]

Answer:

Step-by-step explanation:

<u>Linear Modeling</u>

Some events can be modeled as linear functions. If a situation comes where a linear model is suitable, then we need two sample points to make the model and predict unknown behaviors.

The linear function can be expressed in the slope-intercept format:

$y=mx+b$

The equation of a line passing through points (x1,y1) and (x2,y2) can be found as follows:

$\displaystyle y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)$

Let's use linear modeling to represent Steven's earnings he makes babysitting. Call y the money he charges by x hours of work.

We know he charges y1=$33 for x1=4 hours, and y2=$57.75 for x2=7 hours. The ordered pairs are (4,33) and ( 7, 57.75)

Computing the equation of the line we have:

$\displaystyle y-33=\frac{57.75-33}{7-4}(x-4)$

Operating:

$\displaystyle y-33=\frac{24.75}{3}(x-4)$

$y - 33 = 8.25( x - 4 )$

$y = 8.25x - 33 + 33$

y = 8.25x

There is a proportional relationship.

6 0

3 years ago

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mafiozo [28]

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3 years ago

Bernard solved the equation 5 x + (negative 4) = 6 x + 4 using algebra tiles. Which explains why Bernard added 5 negative x-tile

LenaWriter [7]

Answer:

To find why he would do this, we need to understand what all the possible first steps are in this equation.

You could add 4 to both sides.

You could subtract 4 from both sides.

You could subtract 5x from both sides.

You could subtract 6x from both sides.

Any of these work. In Bernard's case, he added 5 negative x tiles, meaning he subtracted. C and D already make no sense, but allow me to further explain. By him subtracting 5x from both sides, the equation turns into:

-4 = x + 4

By this point, he can just subtract 4 from both sides to find the value of x. But the question asks for why he did the first step. Therefore, it would

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3 years ago

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Katie cut out a piece of wrapping paper that was 2 times as long and 3times as wide as the box that she was wrapping.The box was

mihalych1998 [28]

10+10+12+12
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4 years ago

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Compute the value of the discriminant and give the number of real solutions of the quadratic equation.

Sergio039 [100]

$-2x^2+6x-3=0 \\ \\
a=-2 \\ b=6 \\ c=-3 \\ \Delta=b^2-4ac=6^2-4 \times (-2) \times (-3)=36-24=12$

The value of the discriminant is 12.
Since the discriminant is greater than zero, the equation has two real solutions.

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3 years ago