Factor k2 - 81. (k + 9)(K + 9) (k - 9)(k - 9) (k - 9)(k + 9)
2 answers:
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1). 5x-3x+7 = 3x-1
2x + 7 = 3x - 1
3x-2x=7+1
x=8
2)
Answer:
4.38%
Step-by-step explanation:
<em>Assuming simple interest</em>, we start by writing the formula for simple interest.
Where
SI is the interest amount (328.13)
P is the principal amount (2500)
r is the rate of interest (what we need to find)
t is the time, in years (t = 3)
Since we want rate of interest, we re-arrange the formula to get r in terms of the other variables. Shown below:
Now we simply plug-in the information we know and find r:
To convert into percentage, we multiply by 100:
r = 0.0438 * 100 = 4.38%