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loris [4]
3 years ago
5

HELP I NEED HELP ASAP

Mathematics
1 answer:
zalisa [80]3 years ago
3 0

Answer:

A is the answer

Step-by-step explanation:

mean of week 1 = 190 / 7 = 27.2

mean of week 2= 220 / 7 = 31.4

31.4 - 27.2 = 4.2 ,approximately 4  

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By what percent will a fraction decrease if its numerator is decreased by 85% and its denominator is decreased by 25%??
belka [17]

Answer:

106.67%

Step-by-step explanation:

85% as a fraction is 4/5

25% as a fraction is 3/4

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17. Which of the following is the correct formula for finding power in a DC circuit? A. P = I2R B. P = VR C. P = IR D. P = V2I
netineya [11]

Answer:

Choice A. P = I² · R where

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Step-by-step explanation:

Electrical power is the rate at which the electrical force does work. So what is electrical work? That's the work W that the electrical force do when it moves charges Q across a potential difference V:

W = V\cdot Q.

The power is the rate at which the electrical force do the work:

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On the other hand, current I is the charge through a cross-section of the circuit in unit time. By the definition of current:

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\displaystyle P =V \cdot \frac{Q}{t} = V\cdot I.

Consider Ohm's Law:

V = I \cdot R.

Therefore

\displaystyle P = V\cdot I = (I \cdot R) \cdot I = I^{2}\cdot R.

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