Is (4,-3) a solution to this system? 3x-3y=21 5x+4y=24

For a sample of 100 men, the median weight is 155 lbs., the first quartile is 150 lbs., and the third quartile is 162 lbs.

Mode for 119 190 145 146 133 119147 104

I have 30 ones, 2 thousands, 4hundred thousands 60 ten, and 100 hundreds. What number am I?

What is ... $500 decreased by 10%

9,000g equals how many kg

Norma received one penny on first day of the month and each day after that she received triple number of pennies

Round-trip bus fare is $2. Justin rides the bus 5 days a weeks to work and 2 nights a week to school. He can buy a pass at school that allows 6 months of unlimited bus rides for $400.

Suppose that the number of inhabitants of country a is given by y=-7.24x+937.69 million, and the number of inhabitants of country b is given y=2.16x+834.29 million, where x is the number of years since 1960.

What is the sum of the geometric sequence 1, 3, 9, if there are 11 terms?

What is the volume of a sphere if the radius is six