Understanding the ways data can be represented in graphs and charts is a key part of comprehending math and science. It is also an essential skill on the ACT math and science sections. Learn the ...

Variables are symbols, usually letters, that stand for unknown or changing values. Expressions are combinations of variables, numbers, and operations that represent a quantity or a rule. For ...

Save guides, add subjects and pick up where you left off with your BBC account. This graph shows the cost of petrol. It shows that 20 litres will cost £23 or £15 will buy 13 litres. Gradient ...

Understanding the ways data can be represented in graphs and charts is a key part of comprehending math and science. It is also an essential skill on the ACT math and science sections.