A sign in a gas station advertises gas at the rate of $3.39 9/10 per gallon. How many dollars does a gallon cost, writing the price as a decimal?
To convert the price from a mixed number to a decimal, we drop the fraction and add it to the whole number. So the price of gas is $3.39 + $0.9 = $<<3.39+0.9=4.29>>4.29. Answer: \boxed{4.29}.
Describe the relationship between rational numbers and whole numbers. Are all rational numbers also whole numbers? Are all whole numbers also rational numbers? Give examples to support your answer.
To convert the mixed number into a decimal, we can add the fraction to the whole number.
$3.39 9/10 is equivalent to $3 + 9/10.
To add 9/10 to 3, we need to find a common denominator, which is 10 in this case.
So, we can rewrite 3 as 30/10, which would be the same value as 3.
Now, adding 30/10 + 9/10 gives us 39/10.
To write it as a decimal, we divide 39 by 10, which gives us 3.9.
Therefore, a gallon of gas costs $3.9 as a decimal.
To convert the price to a decimal, you need to drop the fractional part after the decimal point. In this case, the fraction is 9/10. To convert this fraction to a decimal, divide the numerator (9) by the denominator (10):
9 รท 10 = 0.9
Therefore, the fraction 9/10 is equal to 0.9 as a decimal.
Now, you can write the price of gas as a decimal by adding the dollars part to the decimal part:
$3 (dollars) + 0.9 (decimal) = $3.9
So, a gallon of gas costs $3.9 when written as a decimal.