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jespinozagarcia805
21.09.2021 •
Mathematics
Simplify 4a + 5a + 6b + 3b
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Ответ:
Step-by-step explanation:
4a + 5a + 6b + 3b
=9a + 9b
= 9(a+b)
Ответ:
y=149(x+1.5)^2+489,505
To find the year in which, y=505000 we shall proceed as follows:
From:
y=149(x+1.5)^2+489,505
substituting y=505000 we shall have:
505000=149(x+1.5)^2+489,505
simplifying the above we get:
0=149(x+1.5)^2-15495
expanding the above we get:
0=149x^2+447x+335.25-15495
simplifying
0=149x^2+447x-15159.8
solving the quadratic equation by quadratic formula we get:
x~8.69771 or x~-11.6977
hence we take positve number:
x~8.69771~8.7 years~9 years
thus the year in which the number will be 505000 will be:
2000+9=2009