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4 years ago

6. At a school supply store, the price of three

Mathematics

2 answers:

AlexFokin [52]4 years ago

7 0

Answer:

Answer is b

Step-by-step explanation:

x= number of notebooks

AnnZ [28]4 years ago

4 0

<h3>The answer is:</h3><h2>B</h2><h2 />

First, look for some of the key words in the word problem.

Now we can use those key words and translate it into an equation.

You don't know the price of 3 notebooks, so you should put: 3x

Instead of saying plus, we can say: +

It says "...3 notebooks plus a $30 backpack..." so we add 30.

Instead of saying "is the same as the", we can say: =

You don't know the price of 11 notebooks either, so you should put: 11x

Now, put together the equation:

3x + 30 = 11x

There is your equation! Match it up with one of the given answers and you will receive B.

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Kevin measured a line to be 12.4 inches long. If the actual length of the line is 15.7 inches, then what was the percent error o

Setler79 [48]

Answer:

The percent error of the measurement, to the nearest tenth of a percent is $21.0\%$

Step-by-step explanation:

Estimated length of a line = 12.4 inches

Actual length of the line = 15.7 inches

Error = 15.7 - 12.4 = 3.3 inches

Percent error of the measurement $=\frac{3.3}{15.7}(100)=21.02$ ≈ 21.0

So, the percent error of the measurement, to the nearest tenth of a percent is $21.0\%$

5 0

3 years ago

The point A(-1, 4) is translated five units right and three units down. Which rule describes the translation?

Musya8 [376]

Answer:

(x+5,y-3)

Step-by-step explanation:

5 units to the right is positive on the x-axis

x+5

3 units down is negative on the y-axis

y-3

6 0

3 years ago

What are vertices of the conic 16x² - 25y² = 400 ?

garri49 [273]

Answer:

(-5, 0) and (5, 0)

Step-by-step explanation:

This equation fits the form for a hyperbola with x-intercepts. The standard form for such an equation is

$\frac{x^2}{a^2}-\frac{y^2}{b^2}=1$

To get the equation in the question into this standard form, divide each term by 400.

$\frac{16x^2}{400}-\frac{25y^2}{400}=\frac{400}{400}\\\frac{x^2}{25}-\frac{y^2}{16}=1$

To find the x-intercepts, make <em>y</em> = 0.

$\frac{x^2}{25}=1\\x^2=25\\x=\pm 5$

The vertices are located at the points (-5, 0) and (5, 0).

<em>Note: </em>There are no <em>y</em>-intercepts; making <em>x</em> = 0 produces no real solutions for <em>y</em>.

5 0

3 years ago

Geometry I need help find the value of theta and round your answer to the nearest tenth.

ira [324]

Answer:

54deg

Step-by-step explanation:

We need to compute the inverse cosine of 10/17. I can't do it by hand, so I used a calculator and it arrived at ~53.97deg which is 54deg rounded to the nearest tenth.

3 0

3 years ago

A playground slide has a price of $770. With sales tax, it will cost $847. What is the sales tax percentage?

GaryK [48]

Answer:

10%

Step-by-step explanation:

divide 770 from 847 u get 1.1 , that 1 whole is the 770 and the .1 is the tax. .1 from 770 is 77 so 770+77=847

6 0

3 years ago