A serving of ice cream contains 1200 calories. One hundred forty-four calories come from fat. What percent of the total calories come from fat???
5 answers
100(144/1200) = ?
Do I multiply or divide the 144 and 1200? How do I set this up in a proportion?
It is not a proportion. It is a fraction.
divide 144 by 1200
get .12
to convert a fraction to a percent, multiply by 100
100 * .12 = 12 %
divide 144 by 1200
get .12
to convert a fraction to a percent, multiply by 100
100 * .12 = 12 %
An unknown radioactive element decays into non-radioactive substances. In 260 days the radioactivity of a sample decreases by 75 percent.
(a) What is the half-life of the element?
half-life: (days)
Round to two decimal places.
(b) How long will it take for a sample of 100 mg to decay to 73 mg?
time needed: (days)
Round to two decimal places.
(a) What is the half-life of the element?
half-life: (days)
Round to two decimal places.
(b) How long will it take for a sample of 100 mg to decay to 73 mg?
time needed: (days)
Round to two decimal places.
The answer is 12% i got it by creating a proportion and cross multiplying .
5 answers