1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Citrus2011 [14]
3 years ago
11

Plzzzz plz help plz I don’t get it

Mathematics
1 answer:
Morgarella [4.7K]3 years ago
7 0

\bf \begin{cases}
r=\textit{Richard's bookmarks amount}\\
R=\textit{Rose's bookmarks amount}\\[-0.5em]
\hrulefill\\
\stackrel{\textit{but we know their amount is the same}}{r=R}
\end{cases}~\hspace{5em}
\begin{array}{llll}
\stackrel{\textit{Richard gave away 28}}{r-28}\\\\
\stackrel{\textit{Rose threw away 16}}{R-16}
\end{array}
\\\\[-0.35em]
\rule{34em}{0.25pt}


\bf \stackrel{\textit{after they got rid of those, the ratio r:R is 2:5}}{\cfrac{\textit{Richard new amount}}{\textit{Rose new amount}}\qquad \cfrac{r-28}{R-16}=\cfrac{2}{5}}~\hspace{5em}\stackrel{\textit{since we know r=R}}{\cfrac{r-28}{r-16}=\cfrac{2}{5}}
\\\\[-0.35em]
~\dotfill\\\\
5(r-28)=2(r-16)\implies 5r-140=2r-32\implies 3r=108
\\\\\\
r=\cfrac{108}{3}\implies \blacktriangleright r=36=R \blacktriangleleft

You might be interested in
If an image of a triangle is congruent to the pre-image, then the scale factor of the dilation must be n=__?
Olin [163]
If the image is congruent to the pre-image, then the scale factor must be 1.
4 0
3 years ago
Read 2 more answers
X divided by 6/7 = 3 and 2/5
Rom4ik [11]
X / 6/7 is 3 2/5. First, concert the numbers to decimals for simplicity sake, and you get x/.857 = 3.4. Multiply both sides by .857 to get x alone and you get x ≈ 2.9143
4 0
2 years ago
please solve the answer and show your work so kara and her four friends ate dinner together at a new restaurant. when bill came,
Free_Kalibri [48]
So, you know that there were 5 people there, Kara and 4 friends. To divide equally, just divide 42.30 by 5=

42.30/5 = 8.46

Each person played $8.46.

Hope this helps!!
~Kiwi
8 0
3 years ago
A 2-column table has 5 rows. The first column is labeled x with entries negative 2, negative 1, 0, 1, 2. The second column is la
andriy [413]

Answer:

Initial value is \frac{1}{2}.

Step-by-step explanation:

Let us assume that the exponential function is f(x) = a(b)^{x} ...... (1)

Now, the point (0,\frac{1}{2}) will satisfy the above equation.

Now, this point on the graph of the exponential function will be sufficient to find the initial value of the function (1) i.e. a.

Now, putting the value x = 0 and y = \frac{1}{2} in the equation (1) we get, f(x) = a(b)^{x}

⇒ \frac{1}{2} = a(b)^{0} = a

⇒ a = \frac{1}{2} (Answer)

10 0
3 years ago
Read 2 more answers
For the following statement identifying the independent independent variable is the faster you drive your car the longer it will
EastWind [94]

Answer: Driving Speed

Step-by-step explanation:

The Independent variable is the one that is being experimented on to see the effect it will have on the dependent variable.

The Independent variable is adjusted to different levels to see if a relationship exists between these adjustments and a change in the dependent variable.

In this scenario the independent variable would be the speed you drive your car whilst time taken to completely stop is the dependent variable because the speed is the variable being adjusted to see the time taken to completely stop the car.

5 0
2 years ago
Other questions:
  • What is the approximate area of the pizza
    10·1 answer
  • Simplify.
    9·2 answers
  • What are the zeros of the function f(x) = x2 +64? (Hint: b=0)
    14·1 answer
  • There are 3 black shoes and 9 red shoes. The ratio is 3:9. What fraction of shoes are black? *
    15·2 answers
  • What is the slope of the line that passes through (5,7) and (-10,-5)
    10·1 answer
  • Pam earns $830 biweekly at her new job. What is her annual salary?
    10·1 answer
  • Which best describes the error in finding the area of the triangle?
    12·1 answer
  • A linear function is shown in the table below
    8·1 answer
  • Doing a Pre-Algebra Unit Test on Khan Academy
    8·2 answers
  • Jackle collects data from two different companies. Each company had four employees. The data is listed in the tables below. Comp
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!