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14.12.2020 •
Mathematics
1. 8 + (-4) =
2. -7 + (-8) =
3. -6 + (-3) =
4. 9 - (-5) =
5. 3 - 7 =
Instructions: use a chip model to solve each problem.
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Ответ:
2. -15
3. -9
4. 14
5. -4
hope this helps have an amazing day!
Ответ:
Step-by-step explanation:
Let x be the number of male fish. Then 2x-15 is the number of female fish, and the ratio of female to male fish is ...
0.65/0.35 = (2x -15)/x . . . . . rational equation
13/7 = 2 - 15/x . . . . . . . . . . . . simplified
15/x = 2 -13/7 = 1/7 . . . . . . . . add 15/x - 13/7
x = 7·15 = 105 . . . . . . . . . . . . multiply by 7x
2x-15 = 210 -15 = 195 . . . . . . use the expression for the number of females
There are 195 female fish and 105 male fish in the tank.