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Mathematics

1 answer:

ELEN [110]2 years ago

8 0

Answer:

Step-by-step explanation:

18/6=3

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What number do we divide by -9 to get 8?

Darya [45]

Answer:

-72 i notice you're having trouble message me and ill help you

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3 years ago

Equation with a slope of -2 and point of (4,7)

s344n2d4d5 [400]

Answer:

y=-2x+15

Step-by-step explanation:

So first we can write it in point slope form.

That is y-y1=m(x-x1)

y1 is the y coordinate

m is the lope

x1 is the x coordinate

This means that the equation is:

y-7=-2(x-4)

We can then convert it to slope intercept form which is

y=mx+b

y-7=-2x+8

y=-2x+15

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2 years ago

Read 2 more answers

A professor has recorded exam grades for 10 students in his class, but one of the grades is no longer readable. If the mean sco

Nostrana [21]

Answer:

unreadable score = 35

Step-by-step explanation:

We are trying to find the score of one exam that is no longer readable, let's give that score the name "x". we can also give the addition of the rest of 9 readable s scores the letter "R".

There are two things we know, and for which we are going to create equations containing the unknowns "x", and "R":

1) The mean score of ALL exams (including the unreadable one) is 80

so the equation to represent this statement is:

mean of ALL exams = 80

By writing the mean of ALL scores (as the total of all scores added including "x") we can re-write the equation as:

$\frac{R+x}{10} =80$

since the mean is the addition of all values divided the total number of exams.

in a similar way we can write what the mean of just the readable exams is:

$\frac{R}{9} = 85\\$ (notice that this time we don't include the grade x in the addition, and we divide by 9 instead of 10 because only 9 exams are being considered for this mean.