How can I tell if a equation is linear or nonlinear.

Which expression is equivalent to sec^2 x cot^2 x?

Solve 0.9 x + 5.1 x - 7 = 2 (2.5x-3). how many solutions dose the equation have?

4/x=7/9 Round to the nearest tenth. 3.1 2.9 5.1 4.8

If cheese is $4.40 per kilogramme, what should I pay for 200 grammes?

Factorise x squared - 12x + 36

A rectangular box has a height of 7 centimeters and a volume of 336 cubic centimeters. The length of the box is three times the width. Write an equation describing this situation and find the length and width of the box.

What is the common multiples of 5,3,8

Write the number that matches my number has 2 hundreds. The tens digit is9 more than the ones digit. My number is?

a passenger trains speed is 60 mph and a freight trains speed is 40 mph the passenger train travels the same distance in 1.5 hours less than the freight train. how long does each train take to make the trip?

there are 74 children at a camp. there are 38 girls. the rest are boys. how many boys are at the camp