Speed is distance over time
miles per hour is distance over time
so if it averaged 420 miles an hour
is it not 420 miles per hour?
perhaps i am misunderstanding something?
Answer:
(√9)^2x-1/2 = 1/81
3^2x-1/2 = 1/(3)⁴. (as √9 = 3)
3^2x-1/2 = 3^-⁴. (as 1/a^m = a^-m)
as base are equal exponents are equal
so 3 gets cancelled out
2x-1/2 = -4
(4x-1)/2 = -4
4x-1 = -8
x = -7/4
hope this helps
Step-by-step explanation:
<span><span><span><span><span>(<span><span>(<span>−3</span>)</span><span>(2)</span></span>)</span><span>(2)</span></span>−<span><span>(<span>−1</span>)</span><span>(3)</span></span></span>+<span><span><span>(3)</span><span>(3)</span></span><span>(2)</span></span></span>−<span><span><span>(2)</span><span>(<span>−1</span>)</span></span><span>(3)
</span></span></span><span>=<span><span><span><span><span>(<span>−6</span>)</span><span>(2)</span></span>−<span><span>(<span>−1</span>)</span><span>(3)</span></span></span>+<span><span><span>(3)</span><span>(3)</span></span><span>(2)</span></span></span>−<span><span><span>(2)</span><span>(<span>−1</span>)</span></span><span>(3)
</span></span></span></span><span>=<span><span><span><span>−12</span>−<span><span>(<span>−1</span>)</span><span>(3)</span></span></span>+<span><span><span>(3)</span><span>(3)</span></span><span>(2)</span></span></span>−<span><span><span>(2)</span><span>(<span>−1</span>)</span></span><span>(3)</span></span></span></span><span>=<span><span><span><span>−12</span>−<span>(<span>−3</span>)</span></span>+<span><span><span>(3)</span><span>(3)</span></span><span>(2)</span></span></span>−<span><span><span>(2)</span><span>(<span>−1</span>)</span></span><span>(3)
</span></span></span></span><span>=<span><span><span>−9</span>+<span><span><span>(3)</span><span>(3)</span></span><span>(2)</span></span></span>−<span><span><span>(2)</span><span>(<span>−1</span>)</span></span><span>(3)
</span></span></span></span><span>=<span><span><span>−9</span>+<span><span>(9)</span><span>(2)</span></span></span>−<span><span><span>(2)</span><span>(<span>−1</span>)</span></span><span>(3)
</span></span></span></span><span>=<span><span><span>−9</span>+18</span>−<span><span><span>(2)</span><span>(<span>−1</span>)</span></span><span>(3)
</span></span></span></span><span>=<span>9−<span><span><span>(2)</span><span>(<span>−1</span>)</span></span><span>(3)
</span></span></span></span><span>=<span>9−<span><span>(<span>−2</span>)</span><span>(3)
</span></span></span></span><span>=<span>9−<span>(<span>−6</span>)
</span></span></span><span>=<span>15</span></span>
