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
kow [346]
3 years ago
11

80% of the students in Lea’s class earned an A or a B on the weekly math test. If 20 students got an A or a B, how many students

are in Lea’s class?
20 is 80% of what number?
20 × 4 = 80, so 100 × 4 = 400 students
20 + 60 = 80, so 100 + 60 = 160 students
80 ÷ 4 = 20, so 100 ÷ 4 = 25 students
80 – 60 = 20, so 100 – 60 = 40 students
Mathematics
2 answers:
blagie [28]3 years ago
8 0

Answer:

c

Step-by-step explanation:

Anna35 [415]3 years ago
6 0

Answer:

80 ÷ 4 = 20, so 100 ÷ 4 = 25 students

Step-by-step explanation:

Is means equals to  and of means multiply

20 = 80% * N

20 = .80 N

Divide each side by .8

20 / .8 = N

25 = N

there are 25 students

You might be interested in
Can you fill the blank space; 19=8, 6=3, 70=7, 8=5, 4=4, 60=5, 15=7, 16=? 17=?<br><br>​
Inga [223]

Answer:

7

9

Step-by-step explanation:

key is the number of letters in each word

  • 16= sixteen= 7 letters
  • 17= seventeen= 9 letters

3 0
3 years ago
help pls ill give extra points !:)
schepotkina [342]
The second choice :D
7 0
2 years ago
Read 2 more answers
$690 is invested in an account earning 7% interest (APR),
sp2606 [1]

Answer:

a

567 is the answer because of the 7percent

4 0
3 years ago
Which of the following ordered pairs could represent the y-intercept of a function.
snow_lady [41]
<h3>Answer: (0,5)</h3>

This is because the x coordinate is 0. For any y intercept, the x coordinate is always 0 as this indicates the point is on the y axis.

Contrast this with something like (9,0) and we see that y = 0 indicating this point is an x intercept (it is on the x axis).

6 0
3 years ago
Find a particular solution to the differential equation y′′+2y′+y=2t2−t+3e−2t. y′′+2y′+y=2t2−t+3e−2t.
Jlenok [28]
y''+2y'+y=2t^2-t+3e^{-2t}

The characteristic equation is

r^2+2r+1=(r+1)^2=0\implies r=-1

so the characteristic solution is

y_c=C_1e^{-t}+C_2te^{-t}

For the particular solution, we can try looking for a solution of the form

y_p=at^2+bt+c+de^{-2t}
\implies{y_p}'=2at+b-2de^{-2t}
\implies{y_p}''=2a+4de^{-2t}

Substituting into the ODE, we have

(2a+4de^{-2t})+2(2at+b-2de^{-2t})+(at^2+bt+c+de^{-2t})=2t^2-t+3e^{-2t}
at^2+(4a+b)t+(2a+2b+c)+de^{-2t}=2t^2-t+3e^{-2t}
\implies\begin{cases}a=2\\4a+b=-1\\2a+2b+c=0\\d=3\end{cases}\implies a=2,b=-9,c=14,d=3

So the general solution to the ODE is

y=y_c+y_p
y=C_1e^{-t}+C_2te^{-t}+2t^2-9t+14+3e^{-2t}
4 0
3 years ago
Other questions:
  • Find the GCF for 15az and 25az
    5·2 answers
  • Carlos didn't earn enough for the last apartment he was looking at, so he is still searching. He found one that costs $625 per m
    15·1 answer
  • Pls help ! <br> simplify
    6·2 answers
  • How to write 0.632 in expanded form
    9·1 answer
  • Ewen has 48 whistle tiles and 16 blue tiles the cost of each white tile was £2 and the cost of each blue tile was £4 Work out th
    12·1 answer
  • How should I figure out the dry mix and the water if I only have the total
    8·1 answer
  • Read the problem in the box below. Make a list to help you find the correct
    11·1 answer
  • Delaney wants to start saving money to buy a 3-D printer. If she needs to save at least $300.00 to pay for it and has decided to
    6·1 answer
  • PLS HELP PLS I BEG U PLS
    13·2 answers
  • For a right triangle ABC, you are told that cos A=X and sun A=y. Which option gives an expression that is equivalent to tan A? X
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!