Which method can justin use to find the product of $1.39
and 100?
justin wants to buy 100 bottles of juice to sell at a school
basketball game. the juice costs $1.39 per bottle, justin
wants to multiply $1.39 by 100 to find the total cost of the
bottles of juice.
he knows that 100 is 10 to the power of 2, so he needs to
move the decimal point in 1.39 two places to the right.
he knows that 100 is 10 to the power of 2, so he needs to
move the decimal point in 1.39 two places to the left.
he knows that 100 is 10 to the power of 3, so he needs to
move the decimal point in 1.39 three places to the right.
he knows that 100 is 10 to the power of 3, so he needs to
move the decimal point in 1.39 three places to the left.

100 is 10^2, move decimal point in 1.39 two places to the right!

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!