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3 years ago

Joe does 140 push-ups and 150 sit-ups each day. How many push-ups and sit-ups will Joe do in 5 days?

Mathematics

2 answers:

shtirl [24]3 years ago

8 0

Answer:

Joe will do 700 push-ups , and 750 sit-ups in 5 days.

Step-by-step explanation:

lora16 [44]3 years ago

4 0

Answer: 700 push ups and 750 sit ups

Step-by-step explanation: if you do the multiplication or addition. Joe would be doing 140, then 280, 420, 560, then 700. When he does his lush ups, he would be doing 150, then 300, 450, 600, then 750. Tried my best to explain.

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I dont know how to solve this one

Olenka [21]

Answer:

The answer is the second option or B, you have to divide the top number by the bottom number to get a unit rate.

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3 years ago

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For which function is f(x) equal to f^1(x) ( answer choices in picture )

Sonja [21]

Answer:

C. $f(x)=\frac{x+1}{x-1}$

Step-by-step explanation:

Let's find the inverse of each of the given options.

Option A:

$f(x)=\frac{x+6}{x-6}\\y=\frac{x+6}{x-6}$

To find $f^{-1}(x)$ , replace 'x' with 'y' and 'y' with 'x'. This gives,

$x=\frac{y+6}{y-6}$

Rewrite in terms of 'y'. This gives,

$x(y-6)=y+6\\xy-6x=y+6\\xy-y=6x+6\\y=\frac{6x+6}{x-1}$

The given function $y=\frac{6x+6}{x-1}\ne y=\frac{x+6}{x-6}$

So, option A is incorrect.

Option B:

$f(x)=\frac{x+2}{x-2}\\y=\frac{x+2}{x-2}$

To find $f^{-1}(x)$ , replace 'x' with 'y' and 'y' with 'x'. This gives,

$x=\frac{y+2}{y-2}$

Rewrite in terms of 'y'. This gives,

$x(y-2)=y+2\\xy-2x=y+2\\xy-y=2x+2\\y=\frac{2x+2}{x-1}$

The given function $y=\frac{2x+2}{x-1}\ne y=\frac{x+2}{x-2}$

So, option B is incorrect.

Option C:

$f(x)=\frac{x+1}{x-1}\\y=\frac{x+1}{x-1}$

To find $f^{-1}(x)$ , replace 'x' with 'y' and 'y' with 'x'. This gives,

$x=\frac{y+1}{y-1}$

Rewrite in terms of 'y'. This gives,

$x(y-1)=y+1\\xy-x=y+1\\xy-y=x+1\\y=\frac{x+1}{x-1}$

The given function $y=\frac{x+1}{x-1}\ equals\ y=\frac{x+1}{x-1}$

So, option C is correct.

Option D:

$f(x)=\frac{x+5}{x-5}\\y=\frac{x+5}{x-5}$

To find $f^{-1}(x)$ , replace 'x' with 'y' and 'y' with 'x'. This gives,

$x=\frac{y+5}{y-5}$

Rewrite in terms of 'y'. This gives,

$x(y-5)=y+5\\xy-5x=y+5\\xy-y=5x+5\\y=\frac{5x+5}{x-1}$

The given function $y=\frac{5x+5}{x-1}\ne y=\frac{x+6}{x-6}$

So, option D is incorrect.

Therefore, only option C is correct.

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3 years ago

A 7-cup carton of ice cream cost $5.60. What is the price per fluid ounce?

ExtremeBDS [4]

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3 years ago

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Marysya12 [62]

2
351
x 5
-------
1,755

351 x 5 = 1,755

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4 years ago

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I ned helk with 41+28

expeople1 [14]

Answer:

41+28=69

Step-by-step explanation:

Add the tens values: 40 + 20 = 60

Add the ones values: 1 + 8 = 9

Combine: 60 + 9 = 69

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