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Vlad [161]
3 years ago
14

What is the percent of change from 4 to 5?

Mathematics
2 answers:
enot [183]3 years ago
7 0

Answer:

The formula for calculating the percent change in a value between two points in time is:

p

=

N

−

O

O

⋅

100

Where:

p

is the percent change - what we are solving for in this problem.

N

is the New Value - 5 in this problem.

O

is the Old Value - 4 in this problem.

Substituting and solving for

p

gives:

p

=

5

−

4

4

⋅

100

p

=

1

4

⋅

100

p

=

100

4

p

=

25

There was a 25% increase from 4 to 5.

Step-by-step explanation:

Andrej [43]3 years ago
4 0

Answer:

25%

Step-by-step explanation:

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Answer c 10cm
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4 0
3 years ago
Please help with algebra problem
kumpel [21]
Number of weekend minutes used: x
Number of weekday minutes used: y

This month Nick was billed for 643 minutes:
(1) x+y=643

The charge for these minutes was $35.44
Telephone company charges $0.04 per minute for weekend calls (x)
and $0.08 per minute for calls made on weekdays (y)
(2) 0.04x+0.08y=35.44

We have a system of 2 equations and 2 unkowns:
(1) x+y=643
(2) 0.04x+0.08y=35.44

Using the method of substitution
Isolating x from the first equation:
(1) x+y-y=643-y
(3) x=643-y

Replacing x by 643-y in the second equation
(2) 0.04x+0.08y=35.44
0.04(643-y)+0.08y=35.44
25.72-0.04y+0.08y=35.44
0.04y+25.72=35.44

Solving for y:
0.04y+25.72-25.72=35.44-25.72
0.04y=9.72

Dividing both sides of the equation by 0.04:
0.04y/0.04=9.72/0.04
y=243

Replacing y by 243 in the equation (3)
(3) x=643-y
x=643-243
x=400

Answers:
The number of weekends minutes used was 400
The number of weekdays minutes used was 243
6 0
3 years ago
Use a system of equations to solve this problem. Dr. Graham currently has two acid solutions. She only has a 60% acid solution a
Natalka [10]
<span>Dr. Graham currently has two acid solutions.
60% acid AND 20% acid </span>
Dr. Graham needs 30 L of a 50% acid solution
We set up 2 equations in which s = 60% acid and t = 20% acid
A) s + t = 30
B) .60s + .20t = (.50 * 30)
We multiply equation A by -.20
A) = -.20s -.20t = -6 then we add it to B)
B) .60s + .20t = 15
.40s = 9
s = 22.5
t = 7.5
So, she needs to mix 22.5 liters of 60% acid with 7.5 liters of 20% acid.

Source:
http://1728.org/mixture.htm


4 0
3 years ago
I need help PLEASE ILL GIVE YOU BRAINLEST
Alexus [3.1K]

Answer:

y= 0.75x + -0.50

A or B is what im guessing

7 0
3 years ago
A hot air ballon begins its descent at a rate of 22.5 feet per minute. How long will it take for the balloon's elevation to chan
notka56 [123]
14 minutes. -315÷22.5=14
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