If we go back to the defenition of logs, we can find this solution quickly.
What you're saying when you say ㏒₂(5x+7) = 5 is that
2⁵ = 5x+7
So
32 = 5x+7
25 = 5x
x = 5
Answer:
B. x < -8 or x > 8
Step-by-step explanation:
You can use process of elimination to solve this problem by going through every solution and testing them out, but let's jump right to B.
Process:
You know that since the inequality states that x^2 has to be greater than 64, x has to be more than 8, or less than -8.
This is because 8^2 = 64, and -8^2 = 64, and the inequality requires the answer to be more than 64.
Looking at B., you can see that if x is < -8, the square of, for example, -9, would be 81. This is greater than 64, so this works!
Now, B. also has an alternative. The 'or' is a major clue to which is the correct answer, since the square root of any number can be positive or negative. (-8^2 = 8^2)
The 'or' states that x must be greater than 8. So, for example, if we take the square of 10, we get 100, and that is also greater than 64.
We've proven that this solution is accurate for both parts, so it is definitely the one we want!
Hope this helps!
Answer:
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Step-by-step explanation:
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Y=<span>−33/<span>5
</span></span><span><span><span><span>53</span>y</span>+3</span>=<span>−8</span></span>Step 1: Subtract 3 from both sides.<span><span><span><span><span>53</span>y</span>+3</span>−3</span>=<span><span>−8</span>−3</span></span><span><span><span>53</span>y</span>=<span>−11</span></span>Step 2: Multiply both sides by 3/5.<span><span><span>(<span>35</span>)</span>*<span>(<span><span>53</span>y</span>)</span></span>=<span><span>(<span>35</span>)</span>*<span>(<span>−11</span>)</span></span></span><span>y=<span><span>−33</span><span>5</span></span></span>
Answer:
8.7
Step-by-step explanation:
Since a square has equal side lengths, the formula for area is s^2, where s stands for side. Since we are given the area, s^2=75 square feet. Take the square root of both sides to get s is equivalent to the square root of 75 square feet. When this becomes a decimal, it is 8.66 feet. Since we are supposed to round to the nearest tenths, it rounds up to 8.7 feet per side length
