3 years ago

The price of an 8-minute phone call is $1.20. What is the price of a 17-minute phone call?

Mathematics

1 answer:

kompoz [17]3 years ago

8 0

2.55 is the price for 17 min phone call

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Manny can assemble a computer by himself in 50 minutes. Lucy does the same job in 45 minutes. How long will it take to assemble

jonny [76]

Manny can assemble a computer in 50 minutes. That means, in a minute Manny does $\frac{1}{50}$ job.

Lucy can assemble a computer in 45 minutes. That means, in a minute Lucy does $\frac{1}{45}$ job.

If they are working together, in a minute they will do:
$\dfrac{1}{50} + \dfrac{1}{45}$
$= \dfrac{9}{450} + \dfrac{10}{450} \text{(equalize the denominator)}$
$=\dfrac{19}{450}$
In a minute they will do $\frac{19}{450}$ job

To finish the job they will do it in $\frac{450}{19}$ minutes or about 24 minutes.

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3 years ago

The foot of an extension ladder is 10 ft from a wall. the ladder is 2 ft longer than the height that it reaches on the wall. how

Mrac [35]

This makes a right triangle with hypotenuse x+2 and legs 10 and x

10²+x²=(x+2)²

100 + x² = x²+4x+4

100=4x+4

4x=96

x=24, the height we are looking for

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3 years ago

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Using the algebraic expression for 4n+6 what is the greatest whole number value of n that will give you a result less than 100

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