Answer:
For edginuity the answer is the last one.
Step-by-step explanation :
You multiply 3 x 3 and it’s 9. Have a great day and stay positive during this pandemic!!
Answer:
13.1 feet
Step-by-step explanation:
C = (1/2)πd
20.56 = (1/2)(3.14)d
20.56 = 1.57d
13.1 feet ≈ d
first off, we know this equation is a quadratic equation, so it is of the form y = ax² + bx + c, where "a, b and c" are digits or constants, and we have no clue what they are.
well, let's take a peek at the table of values and let's make, hmmm usually we'd end up with a system of equations of 3 variables, but in this case we can cook it earlier by being wimpy and using the (0 , 0) point from the table, that says that y = 0 and x = 0, then we'll be using the point (-2 , 0), again being wimpy for the 0 and we know that y = 0 whilst x = -2.
![y = ax^2+bx+c \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{using (0 , 0)}}{0 = a(0)^2+b(0)+c}\implies \boxed{0=c} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{using (-2 , 0)}}{0=a(-2)^2+b(-2)+0}\implies 0=4a-2b\implies 2b=4a \\\\\\ \cfrac{2b}{2}=2a\implies \underline{b=2a} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{using (2 , 4)}}{4=a(2)^2+b(2)+0}\implies 4=4a+2b\implies \stackrel{\textit{substituting 2b}}{4=4a+2(2a)} \\\\\\ 4=4a+4a\implies 4=8a\implies \cfrac{4}{8}=a\implies \boxed{\cfrac{1}{2}=a}](https://tex.z-dn.net/?f=y%20%3D%20ax%5E2%2Bbx%2Bc%20%5C%5C%5C%5C%5B-0.35em%5D%20~%5Cdotfill%5C%5C%5C%5C%20%5Cstackrel%7B%5Ctextit%7Busing%20%280%20%2C%200%29%7D%7D%7B0%20%3D%20a%280%29%5E2%2Bb%280%29%2Bc%7D%5Cimplies%20%5Cboxed%7B0%3Dc%7D%20%5C%5C%5C%5C%5B-0.35em%5D%20~%5Cdotfill%5C%5C%5C%5C%20%5Cstackrel%7B%5Ctextit%7Busing%20%28-2%20%2C%200%29%7D%7D%7B0%3Da%28-2%29%5E2%2Bb%28-2%29%2B0%7D%5Cimplies%200%3D4a-2b%5Cimplies%202b%3D4a%20%5C%5C%5C%5C%5C%5C%20%5Ccfrac%7B2b%7D%7B2%7D%3D2a%5Cimplies%20%5Cunderline%7Bb%3D2a%7D%20%5C%5C%5C%5C%5B-0.35em%5D%20~%5Cdotfill%5C%5C%5C%5C%20%5Cstackrel%7B%5Ctextit%7Busing%20%282%20%2C%204%29%7D%7D%7B4%3Da%282%29%5E2%2Bb%282%29%2B0%7D%5Cimplies%204%3D4a%2B2b%5Cimplies%20%5Cstackrel%7B%5Ctextit%7Bsubstituting%202b%7D%7D%7B4%3D4a%2B2%282a%29%7D%20%5C%5C%5C%5C%5C%5C%204%3D4a%2B4a%5Cimplies%204%3D8a%5Cimplies%20%5Ccfrac%7B4%7D%7B8%7D%3Da%5Cimplies%20%5Cboxed%7B%5Ccfrac%7B1%7D%7B2%7D%3Da%7D)
![~\dotfill\\\\ \stackrel{\textit{we know that}}{b=2a}\implies b=2\left( \cfrac{1}{2} \right)\implies \boxed{b=1} \\\\[-0.35em] ~\dotfill\\\\ y=\cfrac{1}{2}x^2+1x+0\implies \boxed{y=\cfrac{1}{2}x^2+x} \\\\[-0.35em] ~\dotfill\\\\ \textit{when x = 4, what's "y"?}\qquad y=\cfrac{1}{2}(4)^2+4\implies y=\cfrac{16}{2}+4\implies y=12](https://tex.z-dn.net/?f=~%5Cdotfill%5C%5C%5C%5C%20%5Cstackrel%7B%5Ctextit%7Bwe%20know%20that%7D%7D%7Bb%3D2a%7D%5Cimplies%20b%3D2%5Cleft%28%20%5Ccfrac%7B1%7D%7B2%7D%20%5Cright%29%5Cimplies%20%5Cboxed%7Bb%3D1%7D%20%5C%5C%5C%5C%5B-0.35em%5D%20~%5Cdotfill%5C%5C%5C%5C%20y%3D%5Ccfrac%7B1%7D%7B2%7Dx%5E2%2B1x%2B0%5Cimplies%20%5Cboxed%7By%3D%5Ccfrac%7B1%7D%7B2%7Dx%5E2%2Bx%7D%20%5C%5C%5C%5C%5B-0.35em%5D%20~%5Cdotfill%5C%5C%5C%5C%20%5Ctextit%7Bwhen%20x%20%3D%204%2C%20what%27s%20%22y%22%3F%7D%5Cqquad%20y%3D%5Ccfrac%7B1%7D%7B2%7D%284%29%5E2%2B4%5Cimplies%20y%3D%5Ccfrac%7B16%7D%7B2%7D%2B4%5Cimplies%20y%3D12)
Answer:
money you need to save per week ≥ price / number of weeks
Step-by-step explanation:
You have to determine the minimum amount of money you need to save each week. This amount of money multiplied by the number of weeks you spend saving must be greater or equal to the price of the item. That is:
number of weeks * money you need to save per week ≥ price
Isolating money saved:
money you need to save per week ≥ price / number of weeks