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3 years ago

5

In a car race, for every mile covered by car A, car B covered 4 miles. The ratio of the number of miles covered by car A to the

number of miles covered by car B is
1 to 1
4 to 4
4 to 1
1 to 4

2 answers:

NNADVOKAT [17]3 years ago

7 0

Answer:

whats the question?

Step-by-step explanation:

katovenus [111]3 years ago

4 0

Answer:

1 to 4 (1:4)

Step-by-step explanation:

every 1 mile to every 4 miles

car A 1 mile to car B 4 miles

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A family is tracking its spending habits. Over the

saw5 [17]

Answer: a) What is a good scale to use for the y axis? -20 units.

(b) What is a good interval to use for the y axis?- 20 units

Step-by-step explanation:

A family is tracking its spending habits. Over the

past year, the grocery bill has ranged from $120 to $180.

We need to plot these points on a coordinate grid.

If we plot the grocery bills along the y-axis, and past years will be plotted along the x-axis.

So, a) Good scale to use for the y-axis will be

1 scale = 20 units

As 120 and 180 are both divisible by 20.

So, it will be a good scale to use for the y-axis.

b) Good interval to use for the y-axis:

It will be again of 20 units.

5 0

3 years ago

A classmate simplified a rational expression below

lara31 [8.8K]

<h2>Part a) </h2><h2>Explain the error in this simplification.</h2>

Given the simplified expression

$1-\frac{2}{x-2}=\frac{x+1}{x+2}$

$1-2\left(x+2\right)=\left(x+1\right)\left(x-2\right)$

$\:1-2x-4=x^2-x-2$

$-2x-3=x^2-x-2\:\:$

$0=x^2-2x-2\:\:$

$0=\left(x-1\right)\left(x-1\right)$

$x=1$

<u><em>Identifying the Main Error</em></u>

$1-\frac{2}{x-2}=\frac{x+1}{x+2}$

$1-2\left(x+2\right)=\left(x+1\right)\left(x-2\right)$ ← ERROR Starts here

<u><em>Here is the Explanation of the Error </em></u>

<u><em /></u>

<u><em /></u> $\mathrm{The\:equation\:should\:have\:been\:Multiplied\:by\:LCM=}\left(x-2\right)\left(x+2\right)$ <em>. </em>In your case you wrongly multiply the equation.

<em><u>CORRECTION</u></em>

<em>HERE IS HOW YOU SHOULD HAVE MULTIPLIED BY </em><em>LCM = (x-2)(x+2):</em>

<em />

$1-\frac{2}{x-2}=\frac{x+1}{x+2}$

$1\cdot \left(x-2\right)\left(x+2\right)-\frac{2}{x-2}\left(x-2\right)\left(x+2\right)=\frac{x+1}{x+2}\left(x-2\right)\left(x+2\right)$

$\left(x-2\right)\left(x+2\right)-2\left(x+2\right)=\left(x+1\right)\left(x-2\right)$

<h2>Part b) </h2><h2>Show your work as you correct the error</h2>

Here is the complete correction of the error.

Considering the expression

$1-\frac{2}{x-2}=\frac{x+1}{x+2}$

$\mathrm{Find\:Least\:Common\:Multiplier\:of\:}x-2,\:x+2:\quad \left(x-2\right)\left(x+2\right)$

$1\cdot \left(x-2\right)\left(x+2\right)-\frac{2}{x-2}\left(x-2\right)\left(x+2\right)=\frac{x+1}{x+2}\left(x-2\right)\left(x+2\right)$

$\left(x-2\right)\left(x+2\right)-2\left(x+2\right)=\left(x+1\right)\left(x-2\right)$

$x^2-2x-8=x^2-x-2$

$x^2-2x-8+8=x^2-x-2+8$

$x^2-2x=x^2-x+6$

$-x=6$

$\frac{-x}{-1}=\frac{6}{-1}$

$x=-6$

3 0

3 years ago

What slope equals -1 and y intercept equals 3

Vlad [161]

Answer:

y = -x + 3

Step-by-step explanation:

The equation of a line with slope equal to -1 and y-intercept equal to 3 has the form

y = mx + b. With m = -1 and b = 3, we get: y = -x + 3

Think about this problem, please. Is there any way in which you could be clearer about what you wanted to learn?

3 0

3 years ago

What is 125x9 64y12 written as a sum of cubes? (25x3)3 (4y4)3 (5x3)3 (16y4)3 (25x3)3 (8y4)3 (5x3)3 (4y4)3.

babunello [35]

The factorization of $\rm 125x^9+64$ is $\rm (5x^3+4)(25x^6-20x^3+16)$ .

<h3>Factorization;</h3>

Factorization is nothing but writing a number as the product of smaller numbers.

Given

Polynomial; $\rm 125x^9+64$

To find the factorization the polynomial equates the equation with zero following all the steps given below.

Then,

The factor of the polynomial is;

$\rm 125x^9+64\\\\125x^9+100x^6+80x^3-100x^6-80x^3+56\\\\5x^3(25x^6-20x^3+16)+4(25x^6-20x^3+16)\\\\(5x^3+4)(25x^6-20x^3+16)$

Hence, the factorization of $\rm 125x^9+64$ is $\rm (5x^3+4)(25x^6-20x^3+16)$ .

To know more about factorization click the link given below.

brainly.com/question/17595467

3 0

3 years ago

A bag contains 5 red balls and 3 blue balls. A ball is picked at random from the bag and not replaced. Another ball is then pick

viktelen [127]

Answer:

13/28

Step-by-step explanation:

<u>Given</u>

5 red ball
3 blue ball

<u>8 total balls</u>

p(r and r) = 5/8*4/7 = 5/14
p(b and b) = 3/8*2/7= 3/28

<u>Added up</u>

5/14 + 3/28 = 10/28 + 3/28 = 13/28

Probability of 2 same colored balls is 13/28

5 0

3 years ago