Answer:
<u>No</u>
Step-by-step explanation:
Remember, she didn't take note of possible defects that may arise during actual construction, hence her prediction may be inaccurate.
Also, the 75 square feet mentioned is more likely based on approximations, and so <em>it is best to think of possible deviation in the actual length of the room due to measurement error.</em>
Answer:
D. 6\sqrt{5}-4\sqrt{7}
Step-by-step explanation:
![3\sqrt{5}-2\sqrt{7}+\sqrt{45}-\sqrt{28} \\3\sqrt{5}-2\sqrt{7}+\sqrt{9*5}-\sqrt{4*7}\\3\sqrt{5}-2\sqrt{7} +3\sqrt{5}-2\sqrt{7}\\ 6\sqrt{5}-4\sqrt{7}](https://tex.z-dn.net/?f=3%5Csqrt%7B5%7D-2%5Csqrt%7B7%7D%2B%5Csqrt%7B45%7D-%5Csqrt%7B28%7D%20%20%20%20%5C%5C3%5Csqrt%7B5%7D-2%5Csqrt%7B7%7D%2B%5Csqrt%7B9%2A5%7D-%5Csqrt%7B4%2A7%7D%5C%5C3%5Csqrt%7B5%7D-2%5Csqrt%7B7%7D%20%2B3%5Csqrt%7B5%7D-2%5Csqrt%7B7%7D%5C%5C%20%206%5Csqrt%7B5%7D-4%5Csqrt%7B7%7D)
Isn't it already in standard form?
Answer:
x ≥ 88
Step-by-step explanation:
In order to have at least an average of 80 after 4 tests, the sum of her scores must be at least 80 * 4 = 320 so we can write the following inequality:
71 + 78 + 83 + x ≥ 320
232 + x ≥ 320
x ≥ 88