First, factor the expression on the top. What two numbers add to get 8 and multiply to 15? 5 and 3! so the top expression factors to (x+3)(x+5). You can cancel the x+3 from the denominator and end up with x+5. Make sense?
4,000. subtract the numbers, then round to the nearest thousand.
1 liter is equal to 1000 milliliters, so we can multiply 200 liters by 1000 to get 200000 milliliters, which should be your answer. In general, the "milli-" prefix denotes a factor of one thousand times smaller, so 1 meter is equal to 1000 millimeters, 1 second is equal to 1000 milliseconds, and so on.
Multiply both sides of second equation by 20 to get
Subtract that from first equation to get
Divide both sides by 0.7 to get
, so about $428.57 was spent in store. This leaves
that was spent online
