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3 years ago

Riley has 250 marbles in his collection.if 50 of them are red,what percent of them is red

Mathematics

2 answers:

Lady_Fox [76]3 years ago

6 0

Riley has 250 marbles in his collection. 50 of the marbles are red.

The fraction $\frac{50}{250}$ represents the 50 marbles that are red out of all the marbles. We can find out what percent of marbles are red by changing the fraction $\frac{50}{250}$ to a percent.

The fraction $\frac{50}{250}$ can be reduced to $\frac{1}{5}$ by dividing both the numerator and denominator by the greatest common factor of 50 and 250.

1 ÷ 5 = 0.2

0.2 × 100 = 20%

Therefore, 20% of the marbles are red.

sleet_krkn [62]3 years ago

5 0

Fraction which are red = 50/250

= 1/5

To get the percent we multiply by 100:-

1/ 5 * 100

= 100/5

= 20% answer

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Answer:

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And we want to find a function:

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And for the other case we have a cost of 155 and we want to find the number of miles associated so we can do this:

$155 = 0.2m + 35$

$155-35= 120 = 0.2 m$

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Step-by-step explanation:

For this case we can define the following notation:

m= represent the miles travelled

C= represent the cost

Part a

For this case we have the following two points given:

$(x_1 = 225, y_1 = 80) , (x_2 = 350, y_2 = 105)$

And we want to find a function:

$C (m) = b_1 m + b_0$

We can find the slope with this formula:

$b_1= \frac{105-80}{350-225}= \frac{25}{125}=0.2$

And then we can use the point $(x_1 = 225, y_1 = 80)$ to find the intercept $b_o$ and we got:

$80 = 0.2*225 +b_0$

$b_0 = 80-45 = 35$

So then the linear function is given by:

$C(m) = 0.2 m + 35$

Part b

For this case we have that m = 475 so we can replace into the function to find the cost like this:

$C(m =475) = 0.2*475 + 35 = 130$

And for the other case we have a cost of 155 and we want to find the number of miles associated so we can do this:

$155 = 0.2m + 35$

$155-35= 120 = 0.2 m$

$m= \frac{120}{0.2}= 600 mi$

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