3 + 2(x + 4)(x - 4)
3 + 2(x^2 - 4x + 4x - 16)
3 + 2(x^2 - 16)
3 + 2x^2 - 32
2x^2 - 29
If you would like an explanation of each step or further help, please let me know! :)
The exam scores are distributed normally with mean 72 and standard deviation 5.
Recall the empirical (68 - 95 - 99.7) rule, which says that approximately 95% of a normal distribution lies within two standard deviations of the mean. Put another way,
Also recall that the normal distribution is symmetric about its mean. This means that
From this last equation, it follows that
That is, about 47.5% of the students scored between 72 and 87 on the exam.
Answer:
Starting with ΔABC, draw the dilation image of the triangle with a center at the origin and a scale factor of two.Dilations involve multiplication. Dilation with scale factor 2, multiply by 2.
The answer is 4900 because you add the 6,400+1,800=8,200 then you subtract the 8,200-3,300= 4,900