Answer:
<em>2</em><em>5</em><em> </em><em>%</em>
Step-by-step explanation:
Cost price = 60 Ghana cedis for 50 metres
Selling price = 1.50 cedis for 1 meter
x cedis for 50 meters
Cross multiply
Selling price = 75 cedis
Profit = Selling price - Cost price
75 - 60
Profit = 15
Profit % =
Profit % = 25 %
Given:
The figure of a right angle triangle.
Hypotenuse = in.
To find:
The missing lengths of the sides.
Solution:
In the given right angle triangle both legs a and b are equal, and hypotenuse is in.
Using Pythagoras theorem, we get
Divide both sides by 2.
Taking square root on both sides.
Side cannot be negative. So,
Thus, the missing side lengths are a=9 in and b=9 in.
Therefore, the correct option is C.
Answer:
Choice A. P = I² · R where
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 that the electrical force do when it moves charges
across a potential difference
:
W = .
The power is the rate at which the electrical force do the work:
.
On the other hand, current is the charge through a cross-section of the circuit in unit time. By the definition of current:
.
.
Consider Ohm's Law:
.
Therefore
.