-2(-9-2a)
18+4a
If you need it so that "a" equals something let me know.
64 to the power of 1 would just be 64. So the answer choices you select would be (43)(82)(28) it means 4 to the power of 3, 8 to the power of 2, and 2 to the power of 8 because when something is the power of a number it means the number multiplied by itself that number of times so for example 5 ² would be 5x5.
I don't understand the formula referred to but 5 minutes is 10 30 second periods, so ten halvings:
![P = 200 (\frac 1 2)^{10} = \frac{25}{128} \approx 0.195 \textrm{ grams}](https://tex.z-dn.net/?f=P%20%3D%20200%20%28%5Cfrac%201%202%29%5E%7B10%7D%20%20%3D%20%5Cfrac%7B25%7D%7B128%7D%20%5Capprox%200.195%20%5Ctextrm%7B%20grams%7D)
Answer: About 0.2 grams
The answer is 4 (136y-21)
Explanation:
Factor 4 out of 544y.
4 (136y) - 12*7
Factor 4 out of -12*7.
4 (136y) + 4 (-3*7)
Factor 4 out of 4.
(136y) + 4 (-3*7)
4 (136y- 3*7)
Multiply -3 by 7.
4 (136y - 21)