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
borishaifa [10]
3 years ago
6

I’m stuck, please give the explanation for the first question.

Mathematics
2 answers:
gladu [14]3 years ago
6 0
----------------------------------------------
Define x:
----------------------------------------------
Let x be the number of students in the second class:
⇒second class = x

There are 3 more students in the first class than in the second class:
⇒first class = x + 3

There are 2 more students in the third class than in the second class:
⇒third class = x + 2

----------------------------------------------
Expression for each class:
----------------------------------------------
First class = x + 3
Second class = x
Third class = x + 2

----------------------------------------------
Expression for total number of students:
----------------------------------------------
Total = x + 3 + x + x + 2
Total =  3x + 5

----------------------------------------------
Find x:
----------------------------------------------
There are 80 students in total, so
3x + 5 = 80
3x = 75
x = 25

----------------------------------------------
Find the number of students in each class:
----------------------------------------------
First class = x + 3 = 25 + 3 = 28
Second class = x = 25
Third class = x + 2 = 25 + 2 = 27

--------------------------------------------------------------------------------------------
Answer: There are 25 students in the second class.
--------------------------------------------------------------------------------------------
Tcecarenko [31]3 years ago
5 0
You should write equation for this
if we put x as the number of students in the second class then the equation will be :
(3 + x) + x(2 + x) = 80 \\ 3 + x + x + 2 + x = 80 \\ 5 + 3x = 80
now you can find the value of x:
5 + 3 x = 80 \\ 3x = 80 - 5 \\ 3x = 75 \\ x =  \frac{75}{3}  = 25
the number of students in the second class is 25


you can find the others, too

first class: 25+ 3=28

third class: 25+ 2=27


good luck
You might be interested in
4(2x + 3) ÷ 5y From the expression above, provide an example of each of the following: sum, term, product, factor, quotient, and
Ann [662]

Answer:

Sum - 2x + 3

term - 2x

Product - 4(2x + 3)

Factor - not present

quotient - (2x + 3) / 5

Coeffecient - 4(2x + 3)

I really hope this helps

6 0
3 years ago
Read 2 more answers
Please help, This is due soon!!! I’ll mark brainiest or what ever it is called
umka2103 [35]

Answer:

c and d

Step-by-step explanation:

using the two angles in the triangle, 1 and 2, it can be 180- the sum of angles 1 and 2, which is c. using angle 4, it can also be 180 - the equation for angle 4

3 0
3 years ago
Read 2 more answers
Twelve people are given two identical speakers, which they are asked to listen to for differences, if any. Suppose that these pe
ruslelena [56]

Answer:

0.0537

Step-by-step explanation:

This follows a binomial distribution with : n

Number of trials 'N' = 12 ; Probability of success (difference between speakers) 'p' = 1/2 or 0.5 ; Probability of failure (no difference b/w speakers) = 1/2 or 0.5 ; No of success 'r' = 3

P (X = 3) = N C r. (p)^r.(q)^(n-r)\\

= 12C3 (0.5)^3 (0.5)^9

0.0537

7 0
3 years ago
If the local linear approximation of f(x) = 2cos x + e^2x at x = 2 is used to find the approximation for f(2.1), then the % erro
yKpoI14uk [10]

<u>Answer-</u>

The % error of this approximation is 1.64%

<u>Solution-</u>

Here,

\Rightarrow f(x) = 2\cos x + e^{2x}

\Rightarrow f'(x) = -2\sin x + 2e^{2x}

And,

\Rightarrow f(2) = 2\cos 2 + e^{4}

\Rightarrow f'(2) = -2\sin 2 + 2e^{4}

Taking (2, f(2)) as a point and slope as, f'(2), the function would be,

\Rightarrow y-y_1=m(x-x_1)

\Rightarrow y-(2\cos 2 + e^{4})=(-2\sin 2 + 2e^{4})(x-2)

\Rightarrow y=(-2\sin 2 + 2e^{4})(x-2)+(2\cos 2 + e^{4})

The value of f(2.1) will be

\Rightarrow y=(-2\sin 2 + 2e^{4})(2.1-2)+(2\cos 2 + e^{4})

\Rightarrow y=(-2\sin 2 + 2e^{4})(0.1)+(2\cos 2 + e^{4})

\Rightarrow y=64.5946

According to given function, f(2.1) will be,

\Rightarrow f(2.1) = 2\cos 2.1 + e^{2(2.1)}

\Rightarrow f(2.1) = 65.6766

\therefore \%\ error=\dfrac{65.6766-64.5946}{65.6766}=0.0164=1.64\%

5 0
3 years ago
What is 1 1/2 into a whole number
drek231 [11]
It can't be a whole number. It can be 1.5, or 1 1/2.
4 0
2 years ago
Read 2 more answers
Other questions:
  • An airplane flies with an constant speed of 440 miles per hour. How far can it travel in 185 minutes? Round to the nearest tenth
    13·1 answer
  • When Jill woke up, the temperature was -3 C. By noon the temperature had increased by 8 C.
    15·1 answer
  • Light travels at 186,000 miles per second. How many FEET does it travel in a microsecond? (A microsecond is a millionth of a sec
    14·1 answer
  • 3x- 5y=7 <br>5x- 2y=- 1<br><br>X=? Y=?
    8·1 answer
  • The graph shows the functions f(x), p(x), and g(x):
    13·1 answer
  • Math questions, pls help me and ill reward &lt;3 : )
    14·1 answer
  • ✨Could y'all help me pls cuz im dumb soooo imma give BRAINLIEST and don't jus pick a random answer (-_-")✨
    11·1 answer
  • A triangle has side measures of 8, 13, 15. Are these the measures of a RIGHT Triangle?
    15·1 answer
  • Can someone please help mee.
    15·1 answer
  • Please Help<br> What does the missing angle in the triangle measure?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!