MATHEMATICS MIDDLE SCHOOL

An electrician needs 3 1/4 rolls of electrical wire to wire each room in a house. How many rooms can he wire with 9 1/4 rolls of wire

Answers

Answer 1

Answer:

Number of rooms can be wired by electrician is approximately 3

Solution:

Given that electrician needs $3(1)/(4)$ rolls of electrical wire to wire each room in a house

To find: number of rooms can he wire with $9(1)/(4)$ rolls of wire

From given information,

Rolls of wire needed for 1 room = $3(1)/(4) = (4 * 3 + 1)/(4) = (13)/(4)$

Total rolls of wire = $9(1)/(4) = (4 * 9 + 1)/(4) = (37)/(4)$

So number of rooms can be wired:

$\text{ number of rooms }=\frac{\text{ total rolls of wire}}{\text{ wire needed for 1 room}}$

$\text{ number of rooms } = ((37)/(4))/((13)/(4)) = (37)/(4) * (4)/(13) = (37)/(13)$

$\rightarrow(37)/(13) = 2.84 \approx 3$

Thus number of rooms can be wired is $(37)/(13)$ or approximately 3 rooms

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What is the answer to 25 - 5t > 10

Answers

$25-5t>10\n-5t>-15\nt<3$

Identify the zero of the function by factoring
12x²-3x=0

Answers

3x(4x-1)=0
3x=0 and 4x-1=0

3x=0
x=0

4x-1=0
add 1
4x=1
divide 4
x=1/4

x=0 or 1/4

factorise 3x(4x-1)=0

If you get 12 how many do you have to get wrong to get an 58%

Answers

Answer:

I'm gonna take some liberty. I assume you mean if there is 12 questions. if so that means you would need to get 5 wrong.

Step-by-step explanation:

Here are step-by-step instructions showing you how we calculated 7 out of 12 as a percentage: The first step is to divide 7 by 12 to get the answer in decimal form: 7 / 12 = 0.5833. Then, we multiplied the answer from the first step by one hundred to get the answer as a percentage: 0.5833 * 100 = 58.33%

A 120 watt light bulb uses about 0.1 kilowatt of electricity per hour.if electricity costs $0.20 per kilowatt hour how much does it cost to have a bulb on for an hour?

Answers

A 120 watt light bulb uses about 0.1 kilowatt of electricity per hour.if electricity costs $0.20 per kilowatt hour. Let's solve how much does it cost to have a bulb on for an hour. => 120 watt = 0.1 kilowatt per hour which costs 0.20 per kilowatt per => 0.1 kilowatt per hour * 0.20 = 0.02 dollars in an hour.

Answer:

$0.02 is the cost to have the bulb on for an hour

Step-by-step explanation:

A 120 watt light bulb uses about 0.1 kilowatt of electricity per hour

We can assume 1 kilowatt per hour = 1 unit

So total units of electricity consumed in 1 hour = 0.1 × 1

= 0.1 kilowatt hour or 0.1 unit

Since cost of one unit or 1 kilowatt hour is = $0.20 per unit or kilowatt hour.

Therefore, total cost to have this bulb on for an hour = Number of units consumed by the light bulb × per unit cost

= 0.1×0.20

= $0.02

$0.02 is the cost to have the bulb on for an hour.