3 years ago

Worth 30 points...Use the frequency table to determine how many students received a score of 80 or better on an

Mathematics

1 answer:

Komok [63]3 years ago

6 0

Answer:

the answer

Step-by-step explanation:

is D

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Question 8

sasho [114]

we are given

system of equations

First equation is

$3x-2y=31$

Second equation is

$3x+2y=-1$

now, we can find augmented matrix

$A=\begin{pmatrix}3&-2&31\\ 3&2&-1\end{pmatrix}$

now, we can change it into reduced row echelon form

step-1: multiply the 1st row by 1/3

$A=\begin{pmatrix}1&-2/3&31/3\\ 3&2&-1\end{pmatrix}$

step-2:add -3 times the 1st row to the 2nd row

$A=\begin{pmatrix}1&-2/3&31/3\\ 0&4&-32\end{pmatrix}$

step-3:multiply the 2nd row by 1/4

$A=\begin{pmatrix}1&-2/3&31/3\\ 0&1&-8\end{pmatrix}$

step-4: add 2/3 times the 2nd row to the 1st row

$A=\begin{pmatrix}1&0&5\\ 0&1&-8\end{pmatrix}$

so, we get

$x=5,y=-8$

Answer is (5,-8)

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3 years ago

Read 2 more answers

Is -5/4 the same as 5/-4? Why or why not?

Charra [1.4K]

Yes because if a negative sign is in a fraction doesnt matter where, it still show that the fraction is negative

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3 years ago

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Sandra had some ribbon to make bows for her hair. she cut the ribbon into 8 pieces. each piece was of a foot long. how long was

DochEvi [55]

8 feet....................

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2 years ago

Name one real-world objeslct that suggests points

JulijaS [17]

Answer:

magnets

Step-by-step explanation:

counter

bottle cap

pushpin

microwave button

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3 years ago

A circle has an area of p square feet and a circumference of q feet. If p=2.5q, what is the radius of the circle?

Zinaida [17]

A=.5*r^2*theta
a=p
2.5q=2pi(r)
2pi(r)=.5(r^2)(2pi)
1=.5r
2=r

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3 years ago