In a class of 32 students

the mean height for the boys is 1.56 metres

the mean height of all 32 students is 1.515 metres

work out the mean mean height of the girls

If 2+2 is 4, then what is minus 1?

At Kim's birthday party, there were 42 guests. If each guests ate 1/6 of a cake (and there was no cake leftover), how many cakes were there?

What is the meaning of a < b < c?

What figure is shown in the drawing? JH, JK, EJ, EK

Molly is planting the flowers using the proportional relationship of 18 pink flowers to 12 white flowers per row. Find the ratio of pink flowers per white flower per row. Is it 3/2?

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