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wolverine [178]
2 years ago
12

Plz help :(

Mathematics
1 answer:
Effectus [21]2 years ago
6 0

Answer:

Step-by-step explanation:

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Select the correct answer. Anna learns in her science class that the human eye blinks an average of 4,200,000 times a year. What
vivado [14]

Answer:

Step-by-step explanation:

A. 4.2E6 because when putting a number into scientific notation, you would want one number in front of the decimal place and then the trailing numbers would follow. The exponent or E stand for how many numbers are after the decimal, which in this case would be 6.  

4,200,000 → 4.2 x 10^6 which is equal to saying 4.2E6

Tip: If the exponent is negative than the decimal would go in the opposite direction. For example:

4,200,000 → 4.2 x 10^-6 would not equal each other because 4.2 x 10^-6 means 0.000004, six numbers would be behind the decimal.

8 0
3 years ago
Which expression have the same value as the product of 2.7 and 4
Maurinko [17]

Answer:

Step-by-step explanation:

2.7*4=10.80

27*0.4=10.80 we multiplied 27 by 10 but divide 4 by 10

0.27*40=10.80

3 0
2 years ago
Find the surface area of the cylinder to the nearest tenth of a square unit. use 3.14 for pi
Alborosie

Given:

  • Height of cylinder is 18.2 cm
  • Radius of cylinder is 3 cm

~

To Find?

  • Surface area

~

Solution:

Using formula:

  • Surface area of cylinder = 2πr (h + r)

~

Substituting values in the formula:

\longrightarrow \sf 2 × 3.14 × 3 (18.2 + 3)

\longrightarrow \sf 6.28 × 3 (21.2)

\longrightarrow \sf 18.84 × 21.2

\longrightarrow \sf 399.4 cm²

~

  • Hence, (B) 399.4 cm² is right answer.
6 0
2 years ago
Please Help.....................................................
Anna71 [15]
There are 13 protons because the atomic number (the number in the top left corner) represents the number of protons. Then, to find the number of neutrons, you take the number of protons and subtract it from the atomic mass (the number on the bottom) when it is rounded. The number of electrons is the same as the protons when the atom is neutral
8 0
3 years ago
How many inches are there a in 13 feet
Andrews [41]

Answer:

156

Step-by-step explanation:

13 x 12 = 156

4 0
2 years ago
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