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
zimovet [89]
3 years ago
14

on a test, a student answered 12 questions correctly. this number represents 80% of the total number of questions were on the te

st?
Mathematics
1 answer:
barxatty [35]3 years ago
6 0

Answer:

Step-by-step explanation:So if he or she answered 12 right and got 80% then if you count to 100% at should be 14 questions I think if i am wrong sorry

12=80%

13=90%

14=100%

You might be interested in
The geometric mean of a number and four times the number is 22. What is the number?
Misha Larkins [42]
2 square root x • 4x= 22

2x=22

x=11

Answer is 11
8 0
2 years ago
Allison wants to buy a game that costs $120. She has saved $30 for the game. She earns $5 per hour babysitting.
sergey [27]

Answer:

Step-by-step explanation:

<em>Cost of game = $120</em>

<em>Current savings = $30</em>

<em>Rate for babysitting (per hour) = $5/hour</em>

<em></em>

<em>So, required equation is :-</em>

<em>120 = 5h + 30</em>

<em>5h = 90</em>

<em>h = 18</em>

<em></em>

<em>She must make $90 by babysitting for 18 more hours.</em>

7 0
2 years ago
Read 2 more answers
From the Pythagorean theorem, what can you infer
mestny [16]

Answer:

It's always longer than either of the legs

Step-by-step explanation:

The hypotenuse is always longer than either of the legs.

6 0
3 years ago
Use the arc length formula to find the length of the curve y = 2 − x2 , 0 ≤ x ≤ 1. Check your answer by noting that the curve is
Lina20 [59]

By using the arc length formula, we will see that the length of the curve is L = 1.48

<h3>How to use the arc length formula?</h3>

Here we have the curve:

y = 2 - x^2   with 0 ≤ x ≤ 1

And we want to find the length of the curve.

The arc length formula for a curve y in the interval [x₁, x₂] is given by:

L  =\int\limits^{x_2}_{x_1} {\sqrt{1 + \frac{dy}{dx}^2} } } \, dx

For our curve, we have:

dy/dx = -2x

And the interval is [0, 1]

Replacing that we get:

L  =\int\limits^{1}_{0} {\sqrt{1 + (-2x)^2} } } \, dx\\\\L  \int\limits^{1}_{0} {\sqrt{1 + 4x^2} } } \, dx\\

This integral is not trivial, using a table you can see that this is equal to:

L = (\frac{Arsinh(2x)}{4}  + \frac{x*\sqrt{4x^2 + 1} }{2})

evaluated from x = 1 to x = 0, when we do that, we will get:

L = \frac{Arsinh(2) + 2*\sqrt{5} }{4}  = 1.48

That is the length of the curve.

If you want to learn more about curve length, you can read:

brainly.com/question/2005046

8 0
2 years ago
Dj Jacqueline is making a playlist for a friend: she is trying to decide what 15 songs to play and in what order they should be
Tasya [4]

Answer:

4.4 * 10^21

Step-by-step explanation:

Given :

Number of pop, n(p) = 10

Number of reggae, n(r) = 25

Number of blues, n(b) = 10

Total number of songs to select (n) = 15

If she wants equal Number if the 3 genres

Each genre will have : 15/3 = 5 songs each

Hence,

(10C5 * 25C5 * 10C5) * n!

Combination formula :

pCr = p! / (p-r)! r!

Using calculator to save computation time :

(10C5 * 25C5 * 10C5) * n!

(252 * 53130 * 252) * 15!

= 4412050844368527360000

= 4.4 * 10^21

3 0
3 years ago
Other questions:
  • How to make 74 cents two ways
    11·1 answer
  • Elaine's jewelry box has a volume of 36 cubic centimeters. Which of the following could be the dimensions of Elaine's jewelry bo
    11·2 answers
  • The least common multiple of two numbers is 30. if you add the two numbers, the sum is 21. what are the numbers?
    6·1 answer
  • Identify a possible first step using the elimination method to solve the system and then find the solution to the system.
    13·1 answer
  • What's the value of z?<br><br><br>Please Help ​
    11·1 answer
  • I need help please!!!
    13·1 answer
  • First consider the system of equations y= -1/2x + 1 and y = x - 5. Then consider the system of inequalities y &gt; -1/2x + 1 and
    12·2 answers
  • What is the area of the figure at the right? 14 cm 38 cm 16 cm 20 cm
    5·1 answer
  • PLEASE HELP FAST
    15·2 answers
  • Help solve for X. I will give brainliest to the best answer!!! PLEASEEEE
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!