1. 10% of what number is 14

2. 25% of what number is 21

3. 15% of what number is 12

4. 140% of what number is 35

need

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.