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3 years ago

Kevin is looking for a job as a piano technician. One classified ad lists a job that

Mathematics

1 answer:

Black_prince [1.1K]3 years ago

7 0

Step-by-step explanation:

Let's assume there are 365 days in a year (If you need to calculate the leap years in just add .25)

365/7=52.14 weeks. $64,600/52.14=$1,238.9. $1,238.9-$1,120=$118.9=$119

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Let f(r) = 6, find f-¹(r)

I am Lyosha [343]

There is no answer because there cannot be one to one function inverse.

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1 year ago

I NEED HELP!!! 0+0 PLEASE HELP!! 50 pts

Burka [1]

Answer:

I think the answer is 0

Step-by-step explanation:

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2 years ago

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A plane covers 2,160 miles in 5.5 hours. what is the average speed of the plane to the nearest tenth?

pantera1 [17]

2160 divided by 5.5 = 392.7 hopefully this is right!

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2 years ago

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What is the zero in the quadratic function f(x)= 9x^2-54x-19?

Alex17521 [72]

Answer:

6.33... and 0.333...

Step-by-step explanation:

The quadratic formula is

$x=\frac{-b+\sqrt{b^2-4ac} }{2a}$ .

It is important because while some quadratics are factorable and can be solved not all are. The formula will solve all quadratic equations and can also give both real and imaginary solutions. Using the formula will require less work than finding the factors if factorable. We will substitute a=9, b=-54 and c=-19.

$x=\frac{-b+/-\sqrt{b^2-4ac} }{2a}\\x=\frac{-(-54)+/-\sqrt{(-54)^2-4(9)(-19)} }{2(9)}\\x=\frac{54+/-\sqrt{2916+684} }{18}$

We will now solve for the plus and the minus.

The plus,,,

$x=\frac{54+\sqrt{3600}}{18}\\x=\frac{54+60}{18}\\x=\frac{114}{18}\\x=6.3$

and the minus...

$x=\frac{54-\sqrt{3600}}{18}\\x=\frac{54-60}{18}\\x=\frac{-6}{18}\\x=-0.333...$

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3 years ago

A bag contains 4 red and 6 green gumballs. if you select 5 of them without looking, how many ways can you get exactly 3 red or e

marusya05 [52]

This is a combination problem. The approach to this is by using the nCr method, where n is the number of total objects and r is the number of success. For example, if you want to get 3 red out of the total 4, then that would be 4C3. That means,

4C3 = 4!/3!(4 - 3)! = 4 ways

If you want to get 2 green out of the total 6, then that would be 6C2. That means,

6C2 = 6!/2!(6-2)! = 15 ways

Therefore, there are a total of 4+15 = 19 ways.

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3 years ago