(4x^2+6x-5)-(-7x^2-4x-2)
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Answer:
The number of cows on Justin's farm is <u>18</u>.
Step-by-step explanation:
Given:
The only animals on farmer Justin's farm are cows and chickens.
Justin counts a total of 45 heads and a total of 126 feet.
Now, to find the number of cows on Justin's farm.
Let the number of cows be
And the number of chickens be
So, the total number of heads are:
......(1)
As, the feet of chicken are 2 and the cows are 4.
Thus, total number of feet are:
Substituting the value of from equation (1) we get:
<em>Subtracting both sides by 90 we get:</em>
<em>Dividing both sides by 2 we get:</em>
<em>The number of cows = 18.</em>
Therefore, the number of cows on Justin's farm is 18.
There is a theorem in Geometry stating that the square of the tangent segment (ST) is equal to the product of the external secant segment (TR) and the whole secant segment (TQ).
SQ x SQ = TR x TQ
SQ squared = 7 x 30
SQ squared = 210
SQ =