Search 75,603 tutors

# how do you solve a trinomial equation? (answer)

Just in case you don't get the "binomials equal to 0 part"  this fact that you can use the two factors to solve for x comes from the "zero property of multiplication". If two numbers (known as factors) give a product of zero when multiplied together, then the only way...

# How do you write a piecewise function from a word problem (answer)

You are right, you need a piecewise function, which you can separate based on the the segments of the domain that are given in words... First, there is the the segment from 0-400 kwh, then the segment from 400 - infinity (what an electric bill!)   Here is how to write...

# write an equation for the line that is perpendicular to the given line and that passes through the given point y=-1/3x+2;(4,2) (answer)

The slopes of two perpendicular lines, when multiplied, have a product of -1.  Therefore, given the eq of the line with a slope of -1/3, we can conclude that the perpendicular line will have a slope of 3. so to start, our equation of interest is y=3x + b, where b is unknown.  Since...

# is there a easier way to learnt Quadratic Equations? (answer)

I think you should play angry birds! No really, we do it in math class all the time.  A quadratic equation describes a parabola, which just happens to be the shape of the curve made by the bird as it is sling-shotted through the air.  Well, really it is an inverted parabola, and I will...

# how can you make math seem fun when you are trying to each someone? (answer)

If your friend likes art, you can use that to motivate discussions about math.  For instance symmetry is a concept that has a lot of art application, as do triangles, squares, etc.  It all depends on what subject she is studying.  You can find interesting lesson plans and tools...

# Physics' Quesion (answer)

You must draw a force diagram on the box.  The weight acts down and is perpendicular to the movement.  It doesn't do any "work" The Floor acts horizontally, opposing motion Normally, I would consider the friction to be proportional to the Normal force and do some...

I think you start with setting each of the equations equal to 29: 5x+2y=29 solve this one for y (in terms of x) 43x+4y+2z=29 67x+3y+4z=29 combine these two so that you eliminate z y= (29-5x)/2 and (86 - 67)x +(8-3)y = 19x+5y = 29. Now you could use these two equations to...

# Physics Another Physics question (answer)

I deleted this answer and tried to post a corrected comment with better formatting...and a sign correction (thanks sung!)

# a manhole cover has a diameter of 3 ft. What is the length of the brass grip-strip that enciricles the cover, making it easier to manage? (answer)

Well, if the grip strip were of no width and could be straightened out to a line (which a piece of rubber cut in a circle couldn't be), then the length of the grip would correspond to the circumference of the manhole cover.   Circumference = 2*PI*radius = PI*diameter  so your answer...

# Is it possible to determine the mean of the distribution of 10 scores, but only 9 are given. (answer)

You can determine the possible range of mean values since you know that the missing value is either a 6,7, or 8... minimum mean = {sum(3, 5, 9, 1, 9, 2, 0, 3, 9) + 6}/10 maximum mean = {sum(3, 5, 9, 1, 9, 2, 0, 3, 9) + 8}/10 range for mean is {4.7<= m <= 4.9}   You...