Fernando has 22 coins consisting of nickels and dimes in his pocket. The total value of the coins is $1.70. Which system of equations can be used to determine the number of nickels, n, and the number of dimes, d, in his pockets.

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 1/√5+1/√5+1=p+q√r , find the values of p, q and r

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?