tayjay95
08.12.2019 •
Mathematics
Me with this question.
fyi: this question is worth a lot of points but answer it correctly, i do not need wrong answers.
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Ответ:
24
Step-by-step explanation:
Let's say that R, N, and M are the ages of Ric, Nancy, and Michael in 1980.
We can write three equations:
R = 2N
N = 2M
(R + 12) + (N + 12) + (M + 12) = 78
Simplify the third equation:
R + N + M + 36 = 78
R + N + M = 42
Substitute the first equation:
2N + N + M = 42
3N + M = 42
Substitute the second equation:
3(2M) + M = 42
6M + M = 42
7M = 42
M = 6
Therefore:
N = 12
R = 24
Ответ:
Step-by-step explanation:
A mathematics teacher wanted to see the correlation between test scores and homework. The homework grade (x) and test grade (y) are given in the accompanying table. Write the linear regression equation that represents this set of data, rounding all coefficients to the nearest tenth. Using this equation, estimate the homework grade, to the nearest integer, for a student with a test grade of 31.
Homework Grade (x) Test Grade (y)
58 52
75 66
66 68
85 74
52 38
74 65
78 76