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Nostrana [21]
3 years ago
9

What is the surface area of a cylinder with base radius 4 and height 7?

Mathematics
2 answers:
blsea [12.9K]3 years ago
8 0
276.46 is the surface area of the cylinder 
Sav [38]3 years ago
7 0
\bf \textit{total surface area of a cylinder}\\\\
S=2\pi r(h+r)~~
\begin{cases}
r=radius\\
h=height\\
-----\\
r=4\\
h=7
\end{cases}\implies S=2\pi (4)(7+4)
\\\\\\
S=8\pi (11)\implies S=88\pi
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Which is the image of (-2, -5) reflected across X=2? <br> (-6, 5) <br> (-2,9) <br> (6,-5) <br> (2,9)
Sedbober [7]

Answer:

(6,-5)

Step-by-step explanation:

As the point is 4 units to the left of X=2, the reflection must be 4 units to the right of X=2

4 0
3 years ago
A sales person is paid a weekly salary of $760, plus a commission of 7.5% of all her sales for the week. Express her weekly inco
Elis [28]

Answer:

1. We can see that salesperson's weekly income is the sum of her constant weekly salary ($760) and a commission which is variable and depends on her weekly sales.

So, if we say that y is her weekly income and x is her weekly sales, we can write this as:

y = 760 + 0.075x

Note that we had to change percentage to decimal number dividing it by 100.

2  Since for each value of x there is only one corresponding value of y, we can say that this is a function. For any value of x we input there is only one solution we get - that is the main feature of function and a way to tell if something is really a function.

Since this is a function, it can also be written as:

f(x) = 760 + 0.075x

3. Domain of a function is, basically, set of all values of x for which the function can work. That practically means that, since x is weekly sale, it can not be negative (one cannot make -$500 sale, for example). However, it is possible that she doesn't make a sale one week, making it possible for x to be 0. Also, the value of her sales doesn't have to be integer (it is quite possible that she makes $673.50 sale).

All this means that appropriate domain for this function are positive real numbers including 0.

6 0
3 years ago
Twenty years ago a small town in Texas had a population of 10,000. The population has increased 8% each year since then. What eq
andrezito [222]

Answer:

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Step-by-step explanation:

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3 years ago
Write the equation of a line perpendicular to 2x + 3y = 4 and passing through (-3,-5).
Tasya [4]

Answer:

Step-by-step explanation:

A line perpendicular to the given line has a slope that is the negative inverse of the reference line.  

Rewrite the given equation in the format of y=mx+b, where mi is the slope and b is the y-intercept (the value of y when x = 0.

2x + 3y = 4

3y=-2x+4

y = -(2/3)X + (4/3)

The reference slope is -(2/3).  The negative inverse is (3/2), which will be the slope of a perpendicular line.  We can write the new line as:

y = (3/2)x + b

Any value of b will still result in a line that is perpendicular.  But we want a value of b that will shift the line so that it intersects the point (-3,-5).  Simply enter this point in the above equation and solve for b.

y = (3/2)x + b

-5 = (3/2)(-3) + b

-5 = -(9/2) + b

-5 = -4.5 + b

b = - 0.5

The equation of the line that is perpendicular to 2x + 3y = 4 and includes point (-3,-5) is

y = (3/2)x - 0.5

6 0
2 years ago
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Answer:

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Step-by-step explanation:

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6 0
3 years ago
Read 2 more answers
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