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3 years ago

I need some help thanks for your time

Mathematics

1 answer:

balandron [24]3 years ago

3 0

Answer:

There are many expressions equivalent to this one, but an example would be 2.5x - 5y - 2.5

Step-by-step explanation:

In this version of the expression, you don't need the parenthesis. If a term is along in parenthesis and all of the operations are addition and subtraction, you can eliminate it.

Also, if you add a negative number, it is the same as subtracting.

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West Virginia math glencone course 2 volume 1 page 191

Step2247 [10]

Answer:

Im not sure but I think its -5

7 0

3 years ago

Consider the set of points defined by z = 5 cos(theta) + 3i sin(theta).

vitfil [10]

Answer:

This is an ellipse.

Step-by-step explanation:

$z=5cos(\theta)+3isin(\theta)$

Applying the angle values in intervals of right angles (90°), the resulting set of values for z are:

$\theta = 0,90,180,270,360$

$z=5,3i,-5,-3i,5$ (again)

If you look at the plot, you will observe how these values represent points in the xy plain. All of them belong to either the x or the y axis.

The resulting figure for the whole set of values of $\theta$ is in fact an ellipse.

4 0

2 years ago

Type the number of years in a century.

Fiesta28 [93]

One Hundred Years is the number of years in a century

6 0

3 years ago

How to do this problem

AlexFokin [52]

Answer:

y=3/8x - 6/7

Step-by-step explanation:

slope intercept is y=mx+b where m=the slope and b=the y intercept

simply plug in the numbers given

6 0

3 years ago

The cost of internet access at a café is a function of time. The costs for 8, 25, and 40 minutes are shown. Write an equation in

PolarNik [594]

Answer:

$y=0.17x+3$
The cost of surfing the web at the café for one hour: $\$13.2$

Step-by-step explanation:

The equation of the line in Slope-Intercept form is:

$y=mx+b$

Where "m" is the slope and "b" is the y-intercept.

Take two points and substitute them into the formula for calculate the slope (The formula is $m=\frac{y_2-y_1}{x_2-x_1}$ ).

Having these points:

$(8,4.36)$ and $(40,9.80)$

You can identify that:

$y_2=4.36\\y_1=9.80\\\\x_2=40\\x_1=8$

Then, the slope is:

$m=\frac{4.36-9.80}{40-8}=0.17$

Substitute the slope and the coordinates of any point on the line into the equation $y=mx+b$ and then solve for "b":

$4.36=0.17(8)+b\\\\4.36-1.36=b\\\\b=3$

Therefore, equation in Slope-Intercept form that represents the function is:

$y=0.17x+3$

Since 1 hour hour has 60 minutes, you need to substitute $x=60$ into the equation and then evaluate, in order to find the cost of surfing the web at the café for one hour. Then:

$y=0.17(60)+3\\\\y=13.2$

6 0

3 years ago