I need to know about linear equations.

How many sublevels are in the n = 3 level?

Write the mixed number as a fraction 2 3/5

What is the solution to the inequality? 12<8 + x A. x< 20 B. x<4 C. x> 20 D. x>4

Find the value of the expression (2x-12) + (1/2xy-10) x=8 y=2

What are the focus and directrix of the parabola with the equation y = 1/12x^2 focus: (3,0); directrix: y=-3 focus: (-3,0); directrix: y = 3 focus: (0,3); directrix: y=-3 focus: (0, - 3); directrix: y = 3

When a line is reflected over the y-axis, the result is A. a line. B. a square. C. an angle. D. a rectangle.

Solve using substitution. 2x-3y x+y=9 just so you know, I know the answer its (3,6). I just need the explanation on how to get that answer using substitution.

A speed boat is traveling at 100 km/hr. How many hours will it take for the boat to cover a distance of 115 km?

A die contains the numbers 1 through 6. David rolls the die 2 times. What is the probability of getting a 3 on the first roll and a 5 on the second roll?

The equation y = 55x + 85 describes the amount of money a plumber charges, where y is the total amount he charges and x is the number of hours he works. The table shows the total amount of money an electrician charges.