Answer:
3/20 or 15%
Step-by-step explanation:
Out of 1,2,3,4, and 5, there are 3 prime numbers. This makes the odds of selecting one of those prime numbers 3/5. Then, saying that he does pick a prime number and discards that card, there are now four cards, one of them being the number one. His chances of selecting this card is 1/4.
To find the probability you need to multiply the two probabilities together.
3/5 times 1/4 is 3/20.
So your answer is 3/20 or 15%.
Answer:
10
Step-by-step explanation:
You need to 8 + 4 = 12 and take the half of 12 and start at -4 and count up 6
Check the picture below.
the surface area of the pyramid is simply the area of the four triangular faces plus the squarish base, and the triangular faces have a base of 12 and an altitude or height of "s", and we know that's 336.
![336~~ = ~~\stackrel{\textit{\LARGE Areas}}{\stackrel{square}{(12)(12)}~~ + ~~\stackrel{\textit{four triangles}}{4\left[ \cfrac{1}{2}(\underset{b}{12})(\underset{h}{s}) \right]}}\implies 336~~ = ~~144~~ + ~~24s \\\\\\ 192=24s\implies \cfrac{192}{24}=s\implies 8~m=s](https://tex.z-dn.net/?f=336~~%20%3D%20~~%5Cstackrel%7B%5Ctextit%7B%5CLARGE%20Areas%7D%7D%7B%5Cstackrel%7Bsquare%7D%7B%2812%29%2812%29%7D~~%20%2B%20~~%5Cstackrel%7B%5Ctextit%7Bfour%20triangles%7D%7D%7B4%5Cleft%5B%20%5Ccfrac%7B1%7D%7B2%7D%28%5Cunderset%7Bb%7D%7B12%7D%29%28%5Cunderset%7Bh%7D%7Bs%7D%29%20%5Cright%5D%7D%7D%5Cimplies%20336~~%20%3D%20~~144~~%20%2B%20~~24s%20%5C%5C%5C%5C%5C%5C%20192%3D24s%5Cimplies%20%5Ccfrac%7B192%7D%7B24%7D%3Ds%5Cimplies%208~m%3Ds)
