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
saw5 [17]
2 years ago
8

An electrician bought 120 feet of electrical wire and used 105 feet of it. What percent of the wire went unused? 15% 12. 5% 8. 7

5% 7%.
Mathematics
2 answers:
Aliun [14]2 years ago
6 0

Answer:

The percent of the wire that went unused was <u>15%.</u>

Step-by-step explanation:

You can set up these equations:

Turn 15% into 0.15

12.5% into 0.125

8.75% into 0.0875

7% into 0.70

Now, the number of wire unused is 15. Since 120 - 105 = 15. So, we can set up these equations to see which percentage it was that got unused:

0.15 x 120 = 18

<u>0.125 x 120 = 15</u>

0.0875 x 120 = 10.5

0.70 x 120 = 84

So, the answer is <u>15%.</u>

Yuri [45]2 years ago
5 0

Answer:

12.5%

Step-by-step explanation:

105 is what percent of 120?

you can use this proportion:

if/of = %/100

in this problem:

is = 105

of = 120

'what percent' = p/100

105/120 = p/100

cross-multiply to get:

120p = 10500

p = 10500/120

p = 87.5

So the electrician used 87.5%, out of 100%, meaning 12.5% went unused

You might be interested in
Simplify 4( x - 6) ^2 / ( x - 6)​
Leno4ka [110]

Answer:

4x - 24

Step-by-step explanation:

\frac{4(x - 6 {)}^{2} }{(x - 6)}

4(x - 6) = 4x - 4 \times 6 = 4x - 24

4x - 24

5 0
2 years ago
Read 2 more answers
Evaluate the given integral by changing to polar coordinates. 8xy dA D , where D is the disk with center the origin and radius 9
BabaBlast [244]

Answer:

0

Step-by-step explanation:

∫∫8xydA

converting to polar coordinates, x = rcosθ and y = rsinθ and dA = rdrdθ.

So,

∫∫8xydA = ∫∫8(rcosθ)(rsinθ)rdrdθ = ∫∫8r²(cosθsinθ)rdrdθ = ∫∫8r³(cosθsinθ)drdθ

So we integrate r from 0 to 9 and θ from 0 to 2π.

∫∫8r³(cosθsinθ)drdθ = 8∫[∫r³dr](cosθsinθ)dθ

= 8∫[r⁴/4]₀⁹(cosθsinθ)dθ

= 8∫[9⁴/4 - 0⁴/4](cosθsinθ)dθ

= 8[6561/4]∫(cosθsinθ)dθ

= 13122∫(cosθsinθ)dθ

Since sin2θ = 2sinθcosθ, sinθcosθ = (sin2θ)/2

Substituting this we have

13122∫(cosθsinθ)dθ = 13122∫(1/2)(sin2θ)dθ

= 13122/2[-cos2θ]/2 from 0 to 2π

13122/2[-cos2θ]/2 = 13122/4[-cos2(2π) - cos2(0)]

= -13122/4[cos4π - cos(0)]

= -13122/4[1 - 1]

= -13122/4 × 0

= 0

5 0
3 years ago
What is the rate of change of the function y = − 1/4 x + 1
scoray [572]

Answer:

-1/4

Step-by-step explanation:

Hello!

The rate of change is also known as the slope.

Standard equation of a line: y = mx + b

  • y: output
  • m:  slope
  • x: input
  • b: y-intercept

So, if we match the standard form to the given function:

  • y = mx + b
  • y = -1/4x + 1

-1/4 is m, or the rate of change.

8 0
2 years ago
X - - 3 = 10 <br><br> What is the value of x?
Pepsi [2]

Answer:

x = 7

Step-by-step explanation:

Rule: an even number of - signs written one after another produces a plus number.

So - - 3 = 3

The rule also lets you do something strange like

- - - - 4 = 4 but you hardly ever see this.

Rule: an odd number of minus signs produces a minus number.

x + 3 = 10                 Subtract 3 from both sides.

x + 3 - 3 = 10 - 3      

x = 7

4 0
2 years ago
Read 2 more answers
I don’t know what the answer is and i need help please !
Lera25 [3.4K]

Answer:

the answer to this question is 6/5

8 0
3 years ago
Other questions:
  • What is the value of the expression (5)"?​
    6·1 answer
  • 752+2x35+100-4012+100000​
    9·2 answers
  • PLEASE HELP ME I AM BIENG TIMED! I WILL GIVE A BRANLIEST AND POINTS!
    15·2 answers
  • Which is the best estimate of the correlation coefficient for the scatter plot?
    9·2 answers
  • Consider the parabola r​(t)equalsleft angle at squared plus 1 comma t right angle​, for minusinfinityless thantless thaninfinity
    10·1 answer
  • What is the answer to this
    13·1 answer
  • What is -3/4 + 2 3/4​
    10·1 answer
  • Match the function with the graph
    6·1 answer
  • Estimate the slope of the tangent line of the function y(t)=\sqrt{(3t+1} at the point t=2.
    15·1 answer
  • Interest is compounded semianually. Find the amount in the account after the given time.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!