Roberto buys 15 balls for 300. how much will you pay for 10 balls?

$200 (or whatever the currency is since it is not specified here)

Step-by-step explanation:

We can create a proportion for this

$300/15 balls = $x/10 balls

Cross-multiplication: 15x = 3000

Divide: x = $200

d

step-by-step explanation:

hello and welcome!

so, when we see the words "proportional" along with a table, we need to know that we're looking numbers that divide by the same thing.

looking at this table, we simply have to do a trial and error, and divide to see which numbers have the same quotient. if you look at choice a & c, they both have equal quotients for three of the numbers, with one exception, so those can't be the answer. looking at b, there is no similarity, so that can't be it. then, we see d; if you divide all the numbers in the table, you'll see that they all divide by two, which is a proportional relationship, and our answer!

also, always remember that the x will always be the number that goes into y, and somewhere behind this table, is a formula. for this specific table, the formula would be:

since our x-value is being divided by two to get the y-value. and if they were to ask for more numbers in the series, this is the formula you would use to find them.

the answer would be 484

step-by-step explanation:

just multiply 0.484 times 1,000 (formula)