a force of 80N is used to pull a 10-kg block at an angle of 60 degrees (shown above) to the right. if the block moves 5 meters to the right, how much work was done on the block?

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

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%

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?