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4 years ago

A ruler is 12 inches long.what is the length of this ruler in centimeters

Mathematics

2 answers:

lawyer [7]4 years ago

8 0

I think it is 30.48 because i looked it up

dexar [7]4 years ago

7 0

It's 30.48 cause each inch is 2.54 centimeters and times it by 12 =30.48

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Hiiiooo!! Can someone please help me ❤️❤️❤️

Alex777 [14]

Answer:

Step-by-step explanation:

40 ÷ 5 = 8

56 ÷ 7 = 8

so then just divide 64 by the one we know, which is 8

64 ÷ 8 = 8

5 0

3 years ago

Adrian and Brian are brothers. They leave the house on their bicycles and head to school that is a distance of 4 km away. Adrian

aleksley [76]

Answer:

Brian's rate is 15 km/hr

Adrian's rate is 16 km/hr

Step-by-step explanation:

Let r = Brian's rate

r + 1 = Adrian's rate

4/r = Brian's time

4/(r + 1) = Adrian's time

The difference in times is 1 min = 1/60 hr

$\frac{4}{r} - \frac{4}{r + 1} = \frac{1}{60}$ LCD = 60r(r + 1)

4(60)(r + 1) - 4(60)r = r(r + 1)

240r + 240 - 240r = $r^{2}$ + r

$r^{2}$ + r - 240 = 0

(r - 15)(r + 16) = 0

r = 15 or r = -16

Since the rate cannot be negative, Brian's rate is 15 km/hr and Adrian's rate is 16 km/hr

7 0

3 years ago

Three persons EB and C work together on a job and finish it finish it in 18 days if E and be working together can finish the job

nikitadnepr [17]

Answer: 30 days

<u>Step-by-step explanation:</u>

Working together, E & B get 1/45 of the job done per day

Working alone, C gets 1/x of the job done per day

Working together, E, B, & C get 1/18 of the job done per day.

$EB:\dfrac{1}{45}\qquad C: \dfrac{1}{x}\qquad EBC:\dfrac{1}{18}\\\\\\\\EB+C=EBC\\\\ \dfrac{1}{45}\ +\dfrac{1}{x}=\dfrac{1}{18}\\\\\\(45\cdot 18\cdot x)\bigg(\dfrac{1}{45}+\dfrac{1}{x}=\dfrac{1}{18}\bigg)\\\\\\.\qquad \qquad 18x+810=45x\\\\.\qquad \qquad \qquad 810=27x\\\\.\qquad\qquad \qquad \large\boxed{30=x}$

7 0

3 years ago

A homeowner must reduce the use of his homes electricity . the home currently consumes 25.7 kwh (kilowatt hours) of electricity

tigry1 [53]

Given:
25.7 kwh of electricity per day.
must reduce 20%

25.7 kwh * 20% = 5.14 kwh * amount of electricity to be reduced.
25.7 kwh - 5.14 kwh = 20.56 kwh * net of reduced electricity

The homeowner will use 20.56 kwh after reduction of 20%.

8 0

4 years ago

The sum of the measures of the interior angles of a convex polygon is 3960°.

scZoUnD [109]

Step-by-step explanation:

The sum of the interior angles of a convex regular polygon is 180 times (n-2), where n is the number of sides. Since we already know the sum, we can write 3,960 = 180(n-2). If you solve for n in this equation, you will have the number of sides.

5 0

3 years ago