Answer:
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Answer:
r = 0.5 or 1/2
Step-by-step explanation:
Simple Interest Rate Formula: A = P(1 + r)^t
Simply plug in our known variables:
2700 = 800(1 + r)³
Now we solve for <em>r</em>:
<em>Divide both sides by 800</em>
27/8 = (1 + r)³
<em>Take the cube root on both sides</em>
∛27/8 = ∛(1 + r)³
<em>Simplify</em>
3/2 = 1 + r
<em>Subtract 1 on both sides</em>
r = 1/2
r = 0.5
Answer:
x = ± 5
Step-by-step explanation:
Given
x² - 4x - 25 = - 4x ( add 4x to both sides )
x² - 25 = 0 ( add 25 to both sides )
x² = 25 ( take the square root of both sides )
x = ±
= ± 5