This is because if for every $50 he saves $5, and he has saved a total of $500, you can set up a proportion to find out how much money he has saved at that point.

The proportion is as follows:

50/5 == 500/x

x is equivalent to the amount of money he has saved

You can cross multiply to get the following equation:

50x == 2500

To isolate x, you must divide both sides by 50, giving you an answer of:

x = 50

This is the same as option D

4 0

3 years ago

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The numbers 5, 6, 7, and 8 are randomly arranged to create a four-digit number. What is the probability that the number formed i

myrzilka [38]

Using the arrangements and the probability concept, it is found that there is a 0.75 = 75% probability that the number formed is not divisible by 4.

A probability is the number of desired outcomes divided by the number of total outcomes.

The number of possible arrangements of n elements is given by $A_n = n!$

In this problem, there are 4 elements, hence $n = 4, T = A_4 = 4! = 24$ .

A number is a multiple of 4 if the number composed by it's last 2 digits are multiples of 4.

Hence, the possible options for the last 2 digits are: 56, 68, 76.

For each of them, there are $A_2 = 2! = 2$ options for the first 2 digits, hence, there will be 2 x 3 = 6 multiples of 4.

The other 18 numbers formed are not divisible by 4, hence:

$p = \frac{18}{24} = 0.75$

0.75 = 75% probability that the number formed is not divisible by 4.

For more on arrangements and probabilities, you can check brainly.com/question/24437717

5 0

2 years ago