Hello!
We are given the equation below.
x+40=3x
We want to get all of the variables on side. First of all let's subtract 40 from both sides.
x=3x-40
Now we rearrange our equation so the commutative property will work.
x=3x+(-40)
x=-40+3x
Now we subtract 3x from both sides.
-2x=-40
We divide both sides by -2.
x=20
Our answer is A) 20.
I hope this helps!
Answer:

Step-by-step explanation:

Subtract 6 from both sides:.

Subtract 1/2n from both sides:


Multiply 2 on both sides:

Divide both sides by 5

10x - 20 + 6x + 8 = 180
16x - 12 = 180
16x = 192
x = 12
Answer:
Given that your friend in not really psychic, he has a probability of P=1.5% of guessing right 15 out of 20 coin flips.
Step-by-step explanation:
We have a binomial distribution problem.
We have to calculate the probability of correctly guessing 15 out of 20 flips of a coin (probability of success for every trial: p=0.5).
We can calculate that with the binomial distribution formula:

Then we can conclude that, given that your friend in not really psychic, it has only 1.5% of guessing right 15 out of 20 coin flips.
The answer is 10.4 because 10 goes into 26 1 time so it will leave you with a decimal