259 Students go on a field trip. There are 19 vehicles, some vans and some buses. 7 students can fit in a van, and 25 students can fit in a bus.
how many buses were there?
how many vans were there?

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

Is the power produced directly proportional to the wind speed, give reasons for your answer?

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)