All categories

3 years ago

It take 23 minutes for 6 people to paint 6 walls, how many minutes does it take 9 people to paint 9 walls

Mathematics

1 answer:

Delvig [45]3 years ago

6 0

I would set up a ratio problem

23 minutes/6 people = x/9 ppl

cross multiply

207 = 6x

x = 34.5 minutes

You might be interested in

This pattern is made from yellow and blue

zhenek [66]

Answer:

Step-by-step Socrates was a Greek philosopher, considered one of the most important, a master of Plato, who called Aristotle a discipleexplanation:

3 0

3 years ago

There are 18 students enrolled in Mr. Baker's class. Today 3 of them are absent. What is the ratio of the number of students pre

Ira Lisetskai [31]

15 to 18. Hope this helps

3 0

4 years ago

Read 2 more answers

If 2 = 6, 3 =12, 4 = 20, 5 = 30, 6 = 42 then 9 = ?

Soloha48 [4]

At first you may get confused but look at those numbers carefully :)

as you see first result is divisible buy one of the product (second product in all cases is unknown)
so let's check where it will lead us :)

$6/2=3$

$12/3=4$

$20/4=5$

$30/5=6$

$42/6=7$

Now you can clearly see that every number was multiplied by number 1 higher than itself.
$2*(2+1)=6$

$3*(3+1)=12$

$4*(4+1)=20$

etc...

it means that after equation sign there should be $90$ because

$9*(9+1)=90$ :)

6 0

3 years ago

Solve for x in the following equation. X/5=25 X=?

worty [1.4K]

Answer:

125

Step-by-step explanation:

25 × 5 = 125

x/5 = 25 × 5 = 125

x = 125

4 0

3 years ago

Read 2 more answers

If F(x)=integral of sqrt(t^3+1) dt from 0 to x, then F'(2)=?

Arlecino [84]

To answer this question, first
let ∫ √(t³+1) dt = g(t) + C
Then g'(t) = √(t³+1) 

F(x) = ∫₀ˣ √(t³+1) dt = g(t) |₀ˣ = g(x) - g(0) 

Now g(x) is some function of x, while g(0) is a constant 

F(x) = g(x) - g(0) 

Differentiate both sides: 
F'(x) = g'(x) - 0 = √(x³+1) 

So you are correct, in this case, we simply replace t with x (this is not always the case) 

F'(2) = √(2³+1) = √9 = 3 

You MUST remember that when dealing with square roots, we have: 
x² = 4 -----> x = -2 or 2 
x = √4 ----> x = 2 

That's why in the quadratic formula: x = (-b ± √(b²-4ac)) / (2a), we use a ± sign in front of square root, otherwise, if we could willy-nilly assign positive and negatives value to √(b²-4ac), then we would have no need for the ± sign. 

Also, when solving x² = 4, we usually have intermediate step 
x = ± √4, where +√4 (or simply √4) = 2, and -√4 = 2

7 0

4 years ago