Thrice a number added to 21 equals 300. What is the number?

1. if we have 3 babies what is the probability they’re going to be all boys? 2. if we roll 2 die at the same time what is the probability of getting less than 10 on the first roll and a 5 on the second roll 3. if we have 3 babies what is the probability their is going to be 2 girls? 4. if we have 3 babies what is the probability of having no more than 1 girl? 5. it we have 3 babies and then have another 3 babies what is the probability of us having at least 1 boy and then having all girls?

If 3x+8=3x+8 is it one solution or no solution

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)