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antoniya [11.8K]
3 years ago
12

The price of a notebook was $3.70 yesterday. Today, the price fell to $3.20 . Find the percentage decrease. Round your answer to

the nearest tenth of a percent.
Mathematics
1 answer:
mario62 [17]3 years ago
6 0

Answer:

13.5% Decrease

Step-by-step explanation:

Use formula (change in value / original value) * 100

Change in value = 3.70 - 3.20 =0.50 Change in value is 0.50

Original Value = 3.70

Use the formula (0.50/3.70) * 100 = 13.5 % Decrease

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Devise the exponential growth function that fits the given​ data, then answer the accompanying question. Be sure to identify the
NemiM [27]

Answer:

The cost in 2015 will be $283.45.

What is the reference point (t=0)?

d. The year 2005.

Step-by-step explanation:

The exponential growth model for the cost is the following:

C(t) = C_{0}e^{rt}

In which C(t) is the cost after t years, C_{0} is the initial cost and r is the decimal inflation rate

In this problem, we have that:

C_{0} = 190, r = 0.04

What will it cost in 2015 assuming the rate of inflation remains​ constant?

2015 is 10 years after 2005, so this is C(10).

C(t) = C_{0}e^{rt}

C(10) = 190*e^{0.04*10} = 283.45

The cost in 2015 will be $283.45.

The reference point is the year in which t = 0, so the year 2005.

7 0
3 years ago
Read 2 more answers
Please help
juin [17]

Answer:

\displaystyle \large{y =  \frac{1}{4} x + 1}

Step-by-step explanation:

Whenever you solve a word problem, our first step is to read and gather the information we find.

<em>"</em><em>A</em><em> </em><em>l</em><em>i</em><em>n</em><em>e</em><em> </em><em>i</em><em>n</em><em>t</em><em>e</em><em>r</em><em>s</em><em>e</em><em>c</em><em>t</em><em>s</em><em> </em><em>t</em><em>h</em><em>e</em><em> </em><em>p</em><em>o</em><em>i</em><em>n</em><em>t</em><em> </em><em>(</em><em>-</em><em>8</em><em>,</em><em>-</em><em>1</em><em>)</em><em> </em><em>a</em><em>n</em><em>d</em><em> </em><em>h</em><em>a</em><em>s</em><em> </em><em>a</em><em> </em><em>s</em><em>l</em><em>o</em><em>p</em><em>e</em><em> </em><em>o</em><em>f</em><em> </em><em>1</em><em>/</em><em>4</em><em>.</em><em> </em><em>W</em><em>h</em><em>a</em><em>t</em><em> </em><em>i</em><em>s</em><em> </em><em>t</em><em>h</em><em>e</em><em> </em><em>s</em><em>l</em><em>o</em><em>p</em><em>e</em><em>-</em><em>i</em><em>n</em><em>t</em><em>e</em><em>r</em><em>c</em><em>e</em><em>p</em><em>t</em><em> </em><em>e</em><em>q</em><em>u</em><em>a</em><em>t</em><em>i</em><em>o</em><em>n</em><em> </em><em>f</em><em>o</em><em>r</em><em> </em><em>t</em><em>h</em><em>i</em><em>s</em><em> </em><em>l</em><em>i</em><em>n</em><em>e</em><em>?</em><em>"</em>

After reading the question, I am going to highlight or bold the contexts that are important to our problem-solving.

<em>"</em><em>A line intersects the point (-8,-1) and has a slope of 1/4. What is the slope-intercept equation for this line?</em><em>"</em>

First, let's understand that <em><u>slope-intercept equation is in the form of y = mx+b where m = slope and b = y-intercept</u></em>

After reading the context, what do we know?

  • a slope of 1/4
  • a line passes through (-8,-1)
  • write in slope-intercept form

We finally have the information — our first step is to write our slope-intercept equation.

\displaystyle \large{y = mx + b}

We know that m is slope which is 1/4 — substitute in the equation.

\displaystyle \large{y =  \frac{1}{4} x + b}

We have used the two information which are a slope of 1/4 and slope-intercept equation.

That only leaves to one information which is a line that passes through (-8,-1).

Since the graph has to pass through the point, we substitute x = -8 and y = -1.

\displaystyle \large{ - 1=  \frac{1}{4} ( - 8)+ b}

After using all information, it seems that we are solving for b-term or y-intercept.

\displaystyle \large{ - 1=  \frac{1}{1} ( - 2)+ b}

From above — cross-division.

\displaystyle \large{ - 1=  1( - 2)+ b} \\  \displaystyle \large{ - 1=   - 2+ b}

Add both sides by 2 to isolate b-term.

\displaystyle \large{ - 1 + 2=   - 2 + 2+ b} \\ \displaystyle \large{ 1=    b}

Therefore, the value of b is 1. From the equation:

\displaystyle \large{y =  \frac{1}{4} x + b}

Substitute b = 1 in the equation.

\displaystyle \large{y =  \frac{1}{4} x + 1}

And we're done!

8 0
3 years ago
Every 10 minutes a teacher can print 480 copies if a teacher printed 720 copies how long did it take
Sedbober [7]

Answer:

10 minutes for 480 copies. Divide 480 by 10 and get 48 copies per minute. If you divide 720 by 48 you get 15, so it takes 15 minutes to make 720 copies.

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
Suppose the solution x=6 increases to x=9 and the left side of the equation stays the same. How would the right side need to cha
hoa [83]

Given that solution for some equation is x=6

Now they want to change x=6 into x=9.

Notice that all equations contans equal sign (=) because both side values are always same.

So if by any chance you want to change value of one side then you must change value on other side too

like we see that 6 changed to 9 by adding 3 on right side then we must add 3 on the left side too

so we get:

x=6

x+3=6+3

x+3=9

Now question says that the left side of the equation stays the same. That is possible only if we move +3 to the right side from the left side so we can write;

x=9-3


8 0
3 years ago
What percent of 48.4 is 20.57<br> 88.83 is 423% of what
aliina [53]
The first 1 is 42.5%

2nd 1 is 21
4 0
4 years ago
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