First, let's determine how many combinations there are without any restrictions. There are 4 letters, so we have 4 options to choose from for the first letter. For the second letter, there are only 3 options, for the third there are only 2 options, and finally for the last letter there is just 1 option. Therefore, we have:
options
Now we can subtract the number of combinations in which a is immediately followed by b.
Instead of having 4 options to choose from, we now only have 3:
ab, c, or d
So using the same logic as before, we have:
options
Now just subtract the 6 combinations that don't work from the total:
24 - 6 = 18
The answer is 18.
60,000+ 5,000 + 50 + 8 and sixty five thousand fifty eight
P= Total # of people who entered the park
t= The time in hours
P=2200t
6600 = 2200t
Divide both sides of the equation by 2200:
3=t
answer : 3 hours
It would be an isosceles triangle. Since there are two sides of the triangle that are congruent, it would be isosceles.
Isosceles has two congruent sides, scalene has none, and equilateral has three.
(A good tip to do is this: count the number of syllables in each word. Then take away two. That's how many sides that triangle has.)
Ex: i-so-sce-les has four syllables. Take away two, you get two. Therefore, an isosceles triangle has two congruent sides.
Hope that helps!