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4 years ago

Multiply (2.5 x 10 ^-8) ( 9x10 ^ - 10 ) Express answer in scientific notation

Mathematics

2 answers:

abruzzese [7]4 years ago

7 0

when you multiply scientific notation numbers add the exponents ( -8 + -10 = -18)

now multiply 2.5 *9 = 22.5

so you now have 22.5x10^-18

now make 22.5 a real scientific number by moving the decimal point 1 place to the right, which subtracts 1 from the exponent

so you get:

2.25x10^-17

earnstyle [38]4 years ago

4 0

2.25 x 10^-17. Because it's negative you move the decimal to the left. So 2.5 x 10^-8 is .000000025 and 9 x 10^-10 is .0000000009.

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John often speed while driving to school in order to arrive on time. The probability that he will speed to school is 0.75. If th

BartSMP [9]

Answer:

0.33

Step-by-step explanation:

Given the following :

P(speeding) = p(s) = 0.75

P(being stopped) = p(t)

P(speeding and gets stopped) = p(s n t) = 0.25

Find the probability that he is stopped, given that he is speeding is written as P(t | s) ;

P(t | s) = p(s n t) / p(s)

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P(s) = 0.75

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4 years ago

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katrin2010 [14]

Answer:

x=3

Step-by-step explanation:

5x+9 = 24

Subtract 9 from each side

5x+9-9 = 24-9

5x = 15

Divide each side by 5

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3 years ago

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Radda [10]

Given:

The rate of interest on three accounts are 7%, 8%, 9%.

She has twice as much money invested at 8% as she does in 7%.

She has three times as much at 9% as she has at 7%.

Total interest for the year is $150.

To find:

Amount invested on each rate.

Solution:

Let x be the amount invested at 7%. Then,

The amount invested at 8% = 2x

The amount invested at 9% = 3x

Total interest for the year is $150.

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Multiply both sides by 100.

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Divide both sides by 50.

$x=\dfrac{15000}{50}$

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The amount invested at 9% is

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Therefore, the stockbroker invested $300 at 7%, $600 at 8%, and $900 at 9%.

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