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2 years ago

Which of the following is written in scientific notation correctly?

Mathematics

1 answer:

snow_lady [41]2 years ago

8 0

Answer:

The answer is B.thus 7.4*10^9

Step-by-step explanation:

This is because,in scientific notation, we deal with numbers which are in the standard form

And from alt A-D , only the alt B is in the standard form. the rest are not in the standard form hence cannot be considered them as written In scientific notation.

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The average value of two positive numbers is 30% less than one of the two numbers. By which percentage is average value bigger t

Viefleur [7K]

Answer:

75% bigger

Step-by-step explanation:

Let the first number be x and the second be y.

So:

$Average = \frac{x + y}{2}$

And:

$Average = (1 - 30\%) * x$ -----30% less than x

Substitute $Average = (1 - 30\%) * x$ in $Average = \frac{x + y}{2}$

$\frac{x + y}{2} = (1 - 30\%) * x$

$\frac{x + y}{2} = (1 - 0.30) * x$

$\frac{x + y}{2} = 0.70 * x$

$\frac{x + y}{2} = 0.70x$

Cross multiply

$x + y = 0.70x * 2$

$x + y = 1.40x$

Collect like terms

$1.40x - x = y$

$0.40x = y$

Make x the subject

$x = \frac{y}{0.40}$

$x = 2.50y$

So, the average is:

$Average = (1 - 30\%) * x$

$Average = (1 - 30\%) * 2.50y$

$Average =0.70 * 2.50y$

$Average =1.75y$

Rewrite as:

$Average =(1 + 0.75)y$

Express as percentage

$Average =(1 + 75\%)y$

This means that the average is 75% bigger than the second number

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2 years ago

If miley has 200 pencils and Katie has 300 more pencils then how many more does Katie have then miley

Yakvenalex [24]

Answer: 300

Step-by-step explanation: 300+200=500

then 500-200=300

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3 years ago

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Which of the following is a sequence that moves on a basis of addition and subtraction?

irinina [24]

It is the first answer

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Brianna just finished a great meal at a restaurant in Wisconsin. The sales tax in Wisconsin is 5%, and it is customary to leave

emmainna [20.7K]

15% = 0.15
tip = 15 * 0.15 = 2.25

5% = 0.05
tax = 15 * 0.15 = 0.75

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2 years ago

9t-3t+4 Please help me ty :)

Ierofanga [76]

Answer: 0.6666666667

Step-by-step explanation: Simplifying

9t + -3t = 4

Combine like terms: 9t + -3t = 6t

6t = 4

Solving

6t = 4

Solving for variable 't'.

Move all terms containing t to the left, all other terms to the right.

Divide each side by '6'.

t = 0.6666666667

Simplifying

t = 0.6666666667

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2 years ago

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