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prohojiy [21]
3 years ago
14

Some students washed 24 cars in 2 hours. how many cars can they wash in 15 hours?

Mathematics
2 answers:
Radda [10]3 years ago
7 0
Itd be c.180 because itd be 12 cars each hour so times 12 by 15
kiruha [24]3 years ago
3 0

Answer:

option c is correct

180 cars can they wash in 15 hours

Step-by-step explanation:

Unit rate defined as the rate are expressed as a quantity 1 such as 4 miles per hour or 5 meter per second.

As per the statement:

Some students washed 24 cars in 2 hours

Then by definition of unit rate.

\text{unit rate per hour}=\frac{24}{2} = 12

We have to find how many cars can they wash in 15 hours

⇒\text{Number of cars washed in 15 hours} = \text{Unit rate per hour} \cdot 15

Substitute the given values we have;

\text{Number of cars washed in 15 hours} = 12 \cdot 15

Simplify:

\text{Number of cars washed in 15 hours} = 180

Therefore, 180 cars can they wash in 15 hours

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Answer:

Cyrus needs to order 3 full pizzas to feed his 11 friends .

Step-by-step explanation:

The number of friends invited  = 11

Share of pizza for each friend = 1/4 pizza

Now,  as  1 friend eats 1/4 of  a pizza.

⇒  11 friends eat  = 11 \times \frac{1}{4}  = 2.75

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Answer:

A blood bank needs 6 people to help with a blood drive. 11 people have volunteered. Find how many different groups of 6 can be formed from the 11 volunteers.

Step-by-step explanation:

A blood bank needs 6 people to help with a blood drive. 11 people have volunteered. Find how many different groups of 6 can be formed from the 11 volunteers.

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3 years ago
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6 0
3 years ago
The height of a triangle is 8 cm more than the base. If the area is 24 cm2, find the height and base of the triangle.
Elden [556K]

Answer:

height = 12 cm

base length = 4 cm

Step-by-step explanation:

area of a triangle

base length × height / 2

x = height

y = base length

x = y + 8

24 = y × (y + 8) / 2

48 = y × (y + 8) = y² + 8y

squared equation

y² + 8y - 48 = 0

solution

y = (-b ± sqrt(b² - 4ac))/(2a)

a = 1

b = 8

c = -48

y = (-8 ± sqrt(64 - 4×-48))/2 = (-8 ± sqrt(64 + 192))/2 =

= (-8 ± sqrt(256))/2 = (-8 ± 16)/2 = -4 ± 8

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but a negative base length did not make any sense, so only y = 4 remains.

x = y + 8 = 4 + 8 = 12 cm

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3 years ago
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