Answer:
-6
Step-by-step explanation:
-3a + 4 = -14
-3a = -14 - 4
-3a = -18
a = -18 / 3
a = -6
I want to say yes it is but it's been a little while since I have learned this
Answer:
i think its D
Step-by-step explanation:
19/4 = 4.75
√20 = 4.47213595
13/3 = 4.3 ( reapeating )
Answer:
a) ![y=\frac{28}{75}(x-1900)+47.3](https://tex.z-dn.net/?f=y%3D%5Cfrac%7B28%7D%7B75%7D%28x-1900%29%2B47.3)
b) 86.5 years
Step-by-step explanation:
All values are rounded to 2 decimal places
a) We can find line by using y =mx+b
![y=mx+b\\m=\frac{y^{2}-y^{1} }{x^{2}-x^{1}}\\m=\frac{69.7-47.3}{1960-1900} \\m=\frac{22.4}{60} \\m=\frac{28}{75}\\c=y-intercept\\y-intercept=47.3\\y=\frac{28}{75} (x-1900)+47.3](https://tex.z-dn.net/?f=y%3Dmx%2Bb%5C%5Cm%3D%5Cfrac%7By%5E%7B2%7D-y%5E%7B1%7D%20%7D%7Bx%5E%7B2%7D-x%5E%7B1%7D%7D%5C%5Cm%3D%5Cfrac%7B69.7-47.3%7D%7B1960-1900%7D%20%5C%5Cm%3D%5Cfrac%7B22.4%7D%7B60%7D%20%5C%5Cm%3D%5Cfrac%7B28%7D%7B75%7D%5C%5Cc%3Dy-intercept%5C%5Cy-intercept%3D47.3%5C%5Cy%3D%5Cfrac%7B28%7D%7B75%7D%20%28x-1900%29%2B47.3)
Therefore the line of best fit is ![y=\frac{28}{75}(x-1900)+47.3\\](https://tex.z-dn.net/?f=y%3D%5Cfrac%7B28%7D%7B75%7D%28x-1900%29%2B47.3%5C%5C)
b) We can do this by using the formula of the best fit line to estimate the life expectancy of someone born in 2005
![y=\frac{28}{75}(x-1900)+47.3\\y=\frac{28}{75}(2005-1900)+47.3\\y=\frac{28}{75}\times105+47.3\\y=86.5](https://tex.z-dn.net/?f=y%3D%5Cfrac%7B28%7D%7B75%7D%28x-1900%29%2B47.3%5C%5Cy%3D%5Cfrac%7B28%7D%7B75%7D%282005-1900%29%2B47.3%5C%5Cy%3D%5Cfrac%7B28%7D%7B75%7D%5Ctimes105%2B47.3%5C%5Cy%3D86.5)
Therefore the estimated life expectancy of someone born in 2005 is 86.5 years
PS. Please give brainliest answer this was a lot of working out