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3 years ago

Z=7f/r+4 , solve for r

Mathematics

1 answer:

lora16 [44]3 years ago

3 0

Answer:

r = ----------- - 4

Step-by-step explanation:

I will assume that you meant:

z = ------------

r + 4

Solve for r. Start by interchanging z and (r + 4):

r + 4 = -----------

Now subtract 4 from both sides. This isolates r:

r = ----------- - 4

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Every time the y-value decreases by 1, the x-value increases by 2, so the slope is -1/2 throughout the line.

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3 years ago

Read 2 more answers

A certain cold remedy has an 88% rate of success of reducing symptoms within 24 hours. Find the probability that in a random sam

Hitman42 [59]

Answer:

The probability of cured people in who took the remedy is 8/9.

Step-by-step explanation:

Success rate of the cold remedy = 88%

The number of people who took the remedy = 45

Now, 88% of 45 = $\frac{88}{100} \times 45 = 39.6$

and 39.6 ≈ 40

So, out of 45 people, the remedy worked on total 40 people.

Now, let E: Event of people being cured by cold remedy

Favorable outcomes = 40

$\textrm{Probability of Event E} = \frac{\textrm{Total number of favorable outcomes}}{\textrm{Total outcomes}}$

or, $\textrm{Probability of people getting cured} = \frac{\textrm{40}}{\textrm{45}}$ = $\frac{8}{9}$

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2 years ago

How many miles did a plane travel if it flew 455 miles per hour in 3 hours and what formula did you have to use

Kitty [74]

Answer:

It flew 1,365 miles

Step-by-step explanation:

Just multiply the speed in mph by the time in hours so 455 * 3

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3 years ago

Slope of the line that passes through (3, -11) and (0, 4), please!

Lorico [155]

Answer:

-5

Step-by-step explanation:

slope formula= $\frac{y1 - y2}{x1 - x2}$

slope of line

$= \frac{4 - ( - 11)}{0 - 3} \\ = \frac{4 + 11}{ - 3} \\ = \frac{15}{ - 3} \\ = - 5$

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3 years ago

David brought a variety pack of delicious donuts for his daughters Amy & Anna. Amy ate 2/3 of the pack and Anna devoured 1/4

Naya [18.7K]

Answer:

Step-by-step explanation:

Let the total number of donuts in the pack be x.

Amy = 2/3x

Anna = 1/4x

David = 1

x - 2/3x - 1/4x = 1

Find common denominators for 2/3 and 1/4

The common denominator is 12

2/3 * 4/4 = 8/12

1/4 * 3/3 = 3/12

x - 8/12x - 3/12x = 1

x - 11/12x = 1

1/12x = 1

x = 12

You can always check

Amy = 8

Anna = 3

So David must equal to 1

Hope this helps :)

Have an awesome day!

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2 years ago