I need sum help with this

What is the probability you get heads?

In counting the number of heads in 4 coin flips, the probability that we get exactly one head is the probability that we get anyone of the following 4 outcomes: HTTT, THTT, TTHT, or TTTH. Each has probability 1/16, so the probability to get exactly one head in 4 flips is 1/16 + 1/16 + 1/16 + 1/16 = 4/16 = 1/4.

What is the probability you get tails?

50% chance

you toss the quarter and get heads. what is the probability you get heads again on a second toss?

The possible outcomes of tossing a coin twice are: H and H, H and T, T and T, T and H. So, there are 4 possible results of tossing a coin twice. Out of this only results in heads first and tails second. So, the probability of getting heads on first toss and tails on second toss is 1/4, which is 25%.

I don’t know the last one though...I hope I was able to help you with the other ones though! ~ your friendly player, MC

Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction