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3 years ago

Write the following number in scientific notation. .00078

Mathematics

1 answer:

Aliun [14]3 years ago

4 0

Answer:

7.8 × 10^-4

Step-by-step explanation:

Although this answer is perfectly O.K., most commonly the base, or the 0.00078, is written as a number with just one digit to the left of the decimal.

To format your number in this way, we'll multiply the .00078 by 10, 4 time(s), making it a 7.8.

We do this, because each multiplication by 10 moves the decimal point to the right one digit.

But in order to keep our number the same number, we must have a × 10-4 next to the 7.8.

So, the final answer is 7.8 × 10^-4

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Given the graph of a system of equations, which

Mrac [35]

Step-by-step explanation:

I have used tick and cross to show true n false

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8 0

3 years ago

93^2 -83^2<br><br> SMART CALCULATED

12345 [234]

Answer:

Step-by-step explanation:

-1760 is the answer 83 times 83 minus 93 times 93 is -1760

8 0

3 years ago

A cylindrical roller 2.5 m in length, 1.5 m in radius when rolled on a road was found to cover the area of 16500 m2 . How many r

eduard

Answer:

701 revolutions

Step-by-step explanation:

Given: Length= 2.5 m

Radius= 1.5 m

Area covered by roller= 16500 m²

Now, finding the Lateral surface area of cylinder to know area covered by roller in one revolution of cylindrical roller.

Remember; Lateral surface area of an object is the measurement of the area of all sides excluding area of base and its top.

Formula; Lateral surface area of cylinder= $2\pi rh$

Considering, π= 3.14

⇒ lateral surface area of cylinder= $2\times 3.14\times 1.5\times 2.5$

⇒ lateral surface area of cylinder= $23.55 \ m^{2}$

∴ Area covered by cylindrical roller in one revolution is 23.55 m²

Next finding total number of revolution to cover 16500 m² area.

Total number of revolution= $\frac{16500}{23.55} = 700.6369 \approx 701$

Hence, Cyindrical roller make 701 revolution to cover 16500 m² area.

8 0

3 years ago

An auto insurance company has 10,000 policyholders. Each policy is defined as: young or old male or female; and married or singl

Blababa [14]

Answer:

880

Step-by-step explanation:

This problem a bit annoying, but let's classify the numbers and see where we can get from there:

Total = 10,000

Young = 3,000

Old = 7,000 (not young defined as 10,000 - 3,000)

Male = 4,600

Female = 5,400

Married = 7,000

Single = 3,000

Young Males = 1,320

Young Females = 3,000 (young) - 1,320 = 1,680

Married Males = 3,010

Married Females = 7,000 - 3,010 = 2,990

Young Married = 1,400

Young Married Males = 600

Young Married Females = 1,400 - 600 = 800

Young Female Single = ?

Young Female = 1,680 from above. But not all of them are single.

Young Married Females = 800 from above

Young Female Single = Young Female - Young Married Females = 1,680 - 800 = 880

6 0

3 years ago

Check whether the points ( -2, 3) , (8,3) ,(6,7) are the vertices of a right triangle

lora16 [44]

Answer:

Given coordinetes of triangle A(−2,3),B(8,3) and C(6,7)

AB=

[8−(−2)]

+(3−3)

(10)

+(0)

100

AC=

[6−(−2)]

+(7−3)

(8)

+(4)

64+16

BC=

(6−8)+[7−(2)]

(−2)

+(4)

4+16

If ABC is a right angled triangle, then square of one side must be equal to sum of suare of other two sides.

100

)

=100

and AC

+BC

)

=100

∴AB

=AC

+BC

thus triangle satisfies the Pythagoras theorem

Hence, the triangle is right angled triangle.

Step-by-step explanation:

8 0

3 years ago