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2 years ago

In one year, the number of times an average person's heart beats is 4.21 107

Mathematics

2 answers:

Sladkaya [172]2 years ago

7 0

42100000, so this is in scientific notation.

Rus_ich [418]2 years ago

5 0

42,100,000 is equivalent

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2 years ago

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dimaraw [331]

Answer:

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2 years ago

Round 3.251 to the hundredths place.

aliya0001 [1]

It would be 3.25 because you can’t round 0.001 up

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2 years ago

The area of a rectangular wall of a barn is 252 square feet. Its length is 10 feet longer than twice its width. Find the length

valentinak56 [21]

Answer: Length = 28 feet and width = 9 feet

Step-by-step explanation:

Let x = width of the wall.

Then, Length of the wall = 10+2x

Since , Area of rectangle = length x width

Then, as per given,

$252= (10+2x)x\\\\\Rightarrow\ 252=10x+2x^2\\\\\Rightarrow\ 2x^2+10x-252=0\\\\\Rightarrow\ x^2+5x-126=0\\\\\Rightarrow\ x^2+14x-9x-126=0\\\\\Rightarrow\ (x+14)-9(x+14)=0\\\\\Rightarrow\ (x+14)(x-9)=0\\\\\Rightarrow\ x=-14 \ or \ x= 9$

Since width cannot be negative , so x = 9

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Hence, length is 28 feet and width is 9 feet of the wall of the barn.

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3 years ago

A plumber charges $55.00 for a service call plus $35.00 per hour. If the total bill was $160.00 . Select an equation , with x re

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Answer:

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