1. If f(x)= 3x+8 find f(3).

solution: 3(3)+8=17: f(3)=17

2. x-2¹⁰=-1,000

solution: x-1,024=1,000: +1,024 to both sides: x=2,024

3. a²+b²=c²

a=90 b=10 c=100

Is it a right triangle?

solution: 90²=8,100: 10²=100: 100²=10,000: 8,100 + 100 is not equal to 10,000. Therefore it is not a right triangle.