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
dybincka [34]
3 years ago
14

18 is 20% of what number?

Mathematics
2 answers:
daser333 [38]3 years ago
7 0
Hi there!

18 is 20% of 90. Why, you may ask?

To solve we just divide both sides by 0.2

We would start off with 0.2x = 18.
NOW divide.
x = 90.

We can check this by seeing that 20% of 90 is equal to 18.

Hope this helps!
maks197457 [2]3 years ago
4 0
Its 3.6  because you take 20%=20%/100% =0.2

20%=0.2

multiply 0.2 by 18      0.2*18= 3.6 i hope this help you :)

You might be interested in
100 POINTS AND BRAINLIEST IF RIGHT A survey asked 12 students how many portable electronic devices they have in their homes. The
Morgarella [4.7K]

Answer:

¾

Step-by-step explanation:

More than 3: 9

P(more than 3) = 9/12 = ¾

6 0
3 years ago
If f (x) = mx+c, f(4) = 11 and f (5)=13 find value of m and c​
inysia [295]

m=2 and c=3

see the attachment for the detailed solution

8 0
3 years ago
Students in a zoology class took a final exam. They took equivalent forms of the exam at monthly intervals thereafter. After t​
juin [17]

Answer:

a. 73; b. 48.9; c. 2; d. 33.8; e. 73

Step-by-step explanation:

Assume the function was

S(t)= 73 - 15 ln(t + 1), t  ≥ 0

a. Average score at t = 0

S(0) = 73 - 15 ln(0 + 1) = 73 - 15 ln(1) = 73 - 15(0) =73 - 0 = 73

b. Average score at t = 4

S(4) = 73 - 15 ln(4 + 1) = 73 - 15 ln(5) = 73 - 15(1.61) =73 - 24.14 = 48.9

c. Average score at t =24

S(24) = 73 - 15 ln(24 + 1) = 73 - 15 ln(25) = 73 - 15(3.22) =73 - 48.28 = 24.7

d. Percent of answers retained

At t = 0. the students retained 73 % of the answers.

At t = 24, they retained 24.7 % of the answers.

\text{Percent retention} = \dfrac{\text{24.7}}{\text{73}} \times 100 \, \% = \text{33.8 \%}\\\\\text{The students retained $\large \boxed{\mathbf{33.8 \, \%}}$ of their original knowledge after two years.}

e. Maximum of the function

The maximum of the function is at t= 0.

Max = 73 %

The graph below shows your knowledge decay curve. Knowledge decays rapidly at first but slows as time goes on.

 

6 0
3 years ago
The number of mosquitoes in a small pool of stagnant water Increases according to the pattern below
pantera1 [17]
I got the answer 3n^2 + 4 but that isn’t one of the listed options. take a look at my working out.
6 0
4 years ago
A pyramid-shaped vat has square cross-section and stands on its tip. The dimensions at the top are 2 m × 2 m, and the depth is 5
Strike441 [17]

Answer:

the water level increases at a rate of 1.718 m/min when the depth is 4 m

Step-by-step explanation:

the volume of the pyramid is

V = (1/3)(height)(area of base) = 1/3 H*L²

For the diagonal in the pyramid

tg Ф = Side Length/ Height = L / H = x / h

where h= depth of water , x= side of the corresponding cross section

therefore x= L *h/H

the volume of the water is

v= 1/3 h*x² = 1/3 (L/H)² h³

in terms of time

v = Q*t

then

Q*t = 1/3 (L/H)² h³

h³ = 3*(H/L)² *Q *t

h = ∛(3*(H/L)² *Q *t) = ∛(3*(H/L)² *Q) *∛t = k* ∛t , where k=∛(3*(H/L)² *Q)

h = k* ∛t

then the rate of increase in depth is dh/dt

dh/dt = 1/3*k* t^(-2/3)

since

t = (h/k)³

dh/dt = 1/3*k* t^(-2/3) = 1/3*k* (h/k)³ ^(-2/3)  = 1/3*k* (h/k)^(-2) = 1/3 k³ / h²

=  1/3 (3*(H/L)²*Q) / h²  = (H/L)²*Q /h²

dh/dt= [H/(h*L)]²*Q

replacing values, when h=4m

dh/dt= [H/(h*L)]²*Q  = [5m/(4m*2m)]² * (3m³/min)= 1.718 m/min

8 0
3 years ago
Other questions:
  • What is the ratio for this ? <br> 2:25
    15·2 answers
  • 5|x3 - 21 + 7 when x = -2.
    10·1 answer
  • For all 5 problems in this assignment, use the following functions:
    5·1 answer
  • Write a real world linear equation for me for 50 points!!!!!!!
    10·1 answer
  • Which equation is true if x = 9? A:3/8 x = 3 3/8 B: 8.7 + x = 17 X: 5x = 40 x:11.5 = 20
    8·1 answer
  • What is the surface area of this right rectangular prism with dimensions of 5 centimeters by 5 centimeters by 6 centimeters?
    8·2 answers
  • 4x+32=24<br> show your work
    6·1 answer
  • Can anyone help me do this please? No Links!!
    6·2 answers
  • With a mean of 100 and standard deviation of 15, what percentage of IQ scores are less than 110
    6·1 answer
  • (Help needed ASAP I’m confused ) Solve the equation by using the distributive property first
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!