They always try to trick you with this. Remember anything 5 or above would round up, anything 4 and under would round down. So look for the tenth place. that's the 9. The number to the right is 8 which is greater than 5. That means round up. You can't round it to 0.1 because that takes it back down. So you just move it over. The answer is 1.0.
Hello :
<span>|–2x| = 4
</span><span>|2x| = 4 equiv : 2x=4 or 2x = -4
x=2 or x=-2</span>
To answer this question, you'll need to use permutations and factorials.
Factorials are any integer with an ! after it. This means that all of the integers before that number are multiplied together with said number.
This question will use the following formula:
n represents the amount of items in a set, and r represents the amount of items in each combination within the set.
You have 18 students, and you can choose any combination of 3 students. Plug your values into the formula:
There are 4896 different combinations of students that Ms. Lunette can choose.
Using the given equation, take the square root of both sides. Both 169 and 9 are perfect squares, so the left side becomes plus or minus 13/3, which is rational. Six plus 13/3 is a rational number, and 6 minus 13/3 is also a rational number. If the solutions of a quadratic equation are rational, then the equation is factorable.