3 + 1/9 = 27/9 + 1/9 = 28/9
2 + 2/5 = 10/5 + 2/5 = 12/5
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So:
[3+(1/9)]/[2+(2/5)]
=(28/9)/(12/5)
=(28/9)*(5/12)
=140/108 = 70/54 = 35/27
Answer:
They are -1, 4 and 7.
Step-by-step explanation:
x^3 - 10x^2 + 17x + 28 = 0
Observation of this equation shows that there is an x -intercept at x = -1 because
-1^3 - 10^(-1)^2 - 17(1) + 28 = -28 + 28
= 0.
So x + 1 must be a factor so we can do the division:
x + 1 ) x^3 - 10x^2 + 17x + 28 ( x^2 - 11x + 28
x^3 + x^2
-11x^2 + 17x
-11x^2 - 11x
28x^2 + 28
x^2 - 11x + 28 = ( x - 4)(x - 7)
x = 4, 7.
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1 + 1 + 1 + 2 = 5
5 x 9 = 45
Therefore, the total number of km is 45.