Juan has 16 coins, all nickels and dimes. this collection of coins is worth $1. 15. how many nickels and dimes are there?

The parabola opens: y=√x-4 (principal square root) up down right left

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.