The length of each leg is unknown is first you would have to figure out how long each leg is, one leg is 30ft because of the 30ft on the other side. But since we don't know how long the top is we have to do 70 - 30 which is 40 now that we have both legs we can use the Pythagorean theorem 30^2 + 40^2 = c^2 the answer is 2500 and if we square it we get 50 hope this helps :)
The confidence interval for a <span>(1−α)%</span> confidence level is given by
<span>
(<span>θ0</span>−<span>Z<span>α/2 </span></span><span>σ/√n</span>, <span>θ0</span>+<span>Z<span>α/2 </span></span><span>σ/√n</span>)
</span><span>θ0</span> is the measured statistic, <span>Z<span>α/2</span></span> is the cutoff/critical value, and <span>σ/<span>√n</span></span> is the standard error. σ is the population standard deviation (if known) or can be estimated by a sample standard deviation. n is the sample size.
The cutoff value depends on the test you wish to use, and <span>θ0</span><span> depends on the statistic you wish to estimate.</span>
-14 add all divide by the amount of numbers to find average
12 inches = 1 foot
144 square inches = 1 square foot
1250 square inches = 1250/144 = 8.68 square feet
Here's the answer, using the quadratic formula