√-80 can be factored out, to see which factors can be square rooted. A pair of factors would be 16 and -5, so that would be 4√-5. But, negative numbers cannot be inside a square root. So, √-1 is the same thing as <em>i</em>, or <u>imaginary number</u>. So, the expression equivalent to √-80 is 4<em>i</em>√5.
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You are right to circle both 10 or 12. Neither can be solved without knowing something about the x values in 10 and the x value of the smaller base in 12.
The value is 62.50
To the get whole value or 100 % of the value, we always divide the value to its corresponding percentage.
25 is the value; 40% is the percentage of 25 from the whole value.
25 / 40% = 62.50
In the event that the value of a part and the whole is given and the percentage is required. Simply divide the part by the whole to get its percentage of the whole.
whole = 62.50
part = 25
25 / 62.50 = 0.40 * 100% = 40%
If the whole value and the percentage is given. To find the value of the percentage, simply multiply the whole to the percentage.
whole = 62.50
percentage = 40%
62.50 * 40% = 25
B should be the only correct answer.
The question is incomplete, the complete question is below:
Scientists have found a relationship between the temperature and the height above a distant planet's surface. , given below, is the temperature in Celsius at a height of kilometers above the planet's surface. The relationship is as follows: T(h) = 30.5 -2.5h.
a) Calculate T^-1(x)
b) T^-1(15)
Answer:
a) 
b) 6.2 °C
Step-by-step explanation:
a) 
b) 
