10. 24x-8. 11. 5x+6x+2x+15x=28x I hope this is right
1/2 × 1/2
1/4 or 25%
probability of tails both times
X = 71 degrees
And here is a sentence to fill the minimum word rule
For this you will have to make a tree diagram
it will be so much easier although there is a way to do it
probability of getting heads is = 1/2 there for 10 tosses its (1/20)^10