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
Alik [6]
3 years ago
5

15% of the students in Mrs. Madison’s math classes have an ‘A’. If 18 students have an ‘A’, how many students are in Mrs. Madiso

n’s math classes? [Type your answer as a number.]
Mathematics
2 answers:
natita [175]3 years ago
6 0
120 .
_________________________________
<span>Explanation: 
_______________________________________________
15% of x = 18 ;  x = total number of students.
_______________________________
Solve for: "x" ; which is our answer.
____________________________________

15 % of x = (15/100) * x = (0.15)x ;
 _______________________________

(0.15) x = 18 ; 

Divide each side by: "(0.15)" ; to isolate "x" on one side of the equation; and to solve for "x" , which is our answer:
_________________________________

</span>(0.15)x / (0.15) = 18 /(0.15) ;
 _____________________________
   x = 120 ;  They are 120 students in Mrs. Madison's math classes.
___________________________________
The question asks to type the answer as a number. So:
______________________________
120 .
_____________________________
Vikentia [17]3 years ago
4 0

Answer:

120 .

_________________________________

Explanation:

_______________________________________________

15% of x = 18 ;  x = total number of students.

_______________________________

Solve for: "x" ; which is our answer.

____________________________________

15 % of x = (15/100) * x = (0.15)x ;

_______________________________

(0.15) x = 18 ;

Divide each side by: "(0.15)" ; to isolate "x" on one side of the equation; and to solve for "x" , which is our answer:

_________________________________

(0.15)x / (0.15) = 18 /(0.15) ;

_____________________________

  x = 120 ;  They are 120 students in Mrs. Madison's math classes.

___________________________________

The question asks to type the answer as a number. So:

______________________________

120 .

_____________________________

You might be interested in
Factor 6y^2(y^2+6y+9) completely.
natali 33 [55]

6y^2(y^2+6y+9)\\\\=6y^2(y^2+2\cdot 3 \cdot y   + 3^2)\\\\=6y^2(y+3)^2\\\\=6y^2(y+3)(y+3)

7 0
2 years ago
Please help me solve this, I can't get a right answer even though it is easy: | 2x + 4 | = 12
Ket [755]
Because the left side is eclipsed in an absolute value, we have two possible values of x, denoted by:
2x+4 = 12 and -(2x+4) = 12

Solving for both of these, we are presented with the two values of x:
x = 4 and x = -8
5 0
3 years ago
A guitar string is plucked at a distance of 0.6 centimeters above its resting position and then released, causing vibration. The
liubo4ka [24]

Answer:

The equation that represents the motion of the string is given by:

y =Ae^{-kt}\cos(2\pi ft)     .....[1] where t represents the time in second.

Given that: A = 0.6 cm (distance above its resting position) , k = 1.8(damping constant) and frequency(f) = 105 cycles per second.

Substitute the given values in [1] we get;

y =0.6e^{-1.8t}\cos(2\pi 105t)  

or

y =0.6e^{-1.8t}\cos(210\pi t)  

(a)

The trigonometric function that models the motion of the string is given by:

y =0.6e^{-1.8t}\cos(210\pi t)

(b)

Determine the amount of time t that it takes the string to be damped so that -0.24\leq y \leq0.24

Using graphing calculator for the equation

y =0.6e^{-1.8x}\cos(210\pi x)

let x = t (time in sec)  

Graph as shown below in the attachment:

we get:

the amount of time t that it takes the string to be damped so that -0.24\leq y \leq0.24 is, 0.5 sec


4 0
3 years ago
On a journey of 600 km, a train was delayed 1 hour and 30 min after having covered 1/4 of the way. To arrive on time at the dest
Sati [7]

Answer:

10 hours

Step-by-step explanation:

(150/x) + 1.5 + (450/(x+15)) = 600/x

Multiply through by x(x + 15):

150(x + 15) + 1.5x(x + 15) + 450x = 600(x + 15)

150x + 2250 + 1.5x^2 + 22.5x + 450x = 600x + 9000

150x + 2250 + 1.5x^2 + 22.5x + 450x - 600x - 9000 = 0

1.5x^2 + 22.5x - 6750 = 0

x = (-22.5 +/- sqrt(22.5^2 - 4(1.5)(-6750))) / (2*1.5)

x = (-22.5 +/- sqrt(506.25 + 40500)) / 3

x = (-22.5 +/- sqrt(41006.25)) / 3

x = (-22.5 +/- 202.5) / 3

x = 180/3 or -225/3

x = 60 or -75

But a negative number doesn't make sense, so therefore x = 60, so the journey took 600/60 = 10  hours.

6 0
3 years ago
C
ElenaW [278]
Hold on let me go do my research I’ll brb .
4 0
3 years ago
Other questions:
  • Estimate the number 78% of 112
    12·2 answers
  • Savannah was paid $87 for 12 hours of babysitting and $65.25 for 9 hours. What is the constant of proportionality that describes
    11·2 answers
  • 1:When Margie visited the beach at Key West, she collected 50 seashells. She had 15 smooth shells and 35 shells with ridges. Wha
    12·1 answer
  • Two sisters start in the same place and walk in opposite directions. The
    5·2 answers
  • Aydin went to the store to buy a new cell phone. He decided on a cell plan where he pays $45 per month. The cost of the phone is
    11·1 answer
  • Find f(5) in the function f(x)=-2(x+1).
    14·2 answers
  • 5,2,4 does this make a triangle
    11·2 answers
  • Please whats the answer?
    6·1 answer
  • SOMEONE HELP ME PLEASE AND STOP PUTTING THOES LINKS PLEASE<br> THIS IS A TEst
    15·1 answer
  • Work out the size of angle a and angle b.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!