-x+6is the same as -(x-6) how do I know? Pls help

1 answer:

4 0

The x becomes negative because the negative sign at the start of the parenthesis distributes to everything inside parenthesis so x becomes -x and the double negative becomes +6 so that is why

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Michael David $150 from his brother. He has paid back 30% so far. How much money does Michael still owe his brother?

eimsori [14]

150——————100%
x——————-30%
x=150*30/100
x=4500/100
x=$45

He owes his brother $45

7 0

4 years ago

1. State if each scenario involves a permutation or a combination. Then find the number of possibilities:(a) Castel and Joe are

BaLLatris [955]

Answer:

a) This is a permutation, there are 210 ways to do it

b) This is a permutation with 6 possibilities

c) This is a combination with a total of 1081575 possibilities

Step-by-step explanation:

a) Here the order does matter bacause it is not the same that they go to France in the weak trip than they go there for 2 days, as a result, this scenario is a permutation.

You need to pick 3 countries from a total of 7, but the order matters, so the total amount of ways to do this is

${7 \choose 3} * 3! = \frac{7!}{(7-3)!} = 210$

b) Here each permutation of 123 will give you a possible (and a different one from the others) lock-combination, so this is again a permutation.

The total amount of ways we have to do the selectio of the lock-combination is the total amount of permutations of a set of 3 elements, in other words, it is 3! = 6.

c) If you only cares about who advances to the finals, then the order doesnt matter here, you just want 8 people out of the 25 available. This is therefore a combination, and the total amount of possible cases are

${25 \choos 8} = 1081575$ .