$\frac{\big{3+y}}{\big{y}}=7\ \ \ \Rightarrow\ \ \ D:\ y \neq 0\\\\ \frac{\big{3+y}}{\big{y}}\cdot y=7\cdot y\\\\3+y=7y\\\\y-7y=-3\\\\-6y=-3\ /:(-6)\\\\y= \frac{3}{6} \\\\y= \frac{1}{2} \ \in\ D$

3 0

4 years ago

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Solve the equation by factoring<br>x^-2x=15

Reil [10]

Step-by-step explanation:

Add one to both sides of the equation:

$x^2 - 2x + 1 = 15 + 1$

$\Rightarrow (x - 1)^2 = 16$

Taking the square root of the equation above, we get

$x - 1 = \pm 4$

$x = 1 \pm 4 = 5, -3$

4 0

3 years ago

19. As part of a cookie recipe, you mix cup of chocolate chips for every 1 cups of

Serggg [28]

Answer: 1 cup

Step-by-step explanation: they have a 1:1 ratio

8 0

3 years ago

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What is the 7th term of the geometric sequence for 400, 200,100,....

loris [4]

Step-by-step explanation:

400,200,100,50,25,12.5, ...... 0.78125

4 0

3 years ago