Explain how to simplify this expression: (7a + 9) + (4a - 7).

Is 17 rational or irrational

Solve y=2x-12 and y=-2x-4 using substitution

What is the measure of the obtuse angle?

One of the astronaut brought 1 kg of his gold and 1 kg of his cotton wool to the moon. When he arrived at the moon, try to guess how much kg of his gold and his cotton wool? Give reason for your answer.

Maximum or minimum f (x) = -5x2-10x+6

Find the area under the line y=4x+1 between x=2 and x=3

Prove the trigonometric identity: (csc^2x) / (cotx) = cscxsecx ... ?

What is (3x + 5) - (x + 2)

1. Simplify. tan (x + 540) 2. Simplify the expression. sec (x - 360) 3. Simplify. 5cos (x) + 3cos (-x)

When looking at a rational function f of x equals the quantity x plus three times the quantity x minus two times the quantity x plus five all divided by the quantity x minus three times the quantity x plus two times the quantity x minus 5, Charles