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3 years ago

Solve each equation. check your solution. -1/2x-7=-11

2 answers:

6 0

$- \frac{1}{2} x-7=-11$ \

$- \frac{1}{2} x=-11+7$ |adding 7 on both sides

$- \frac{1}{2} x*2=-4*2$ |multiplying by -2 on both sides

$-x = -8$ |dividing by -1 on both sides

$x = 8$

So, the solution is x =8

cupoosta [38]3 years ago

4 0

I'll offer you a deal in return for your 5 points: I'll solve it . . . . You check it.

-1/2x - 7 = -11

Add 7 to each side: -1/2 x = -4

Multiply each side by 2 : - x = -8

Multiply each side by -1 :  x = 8

Take it Allalala !

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Answer:

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We know that the average American shower lasts for 8.2 minutes and uses 17.2 gallons of water. A person showers once a day for a year.

We know that one year have 52 weeks, and one week have 7 days.

We calculate:

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3 years ago

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Sergio039 [100]

Answer:

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Step-by-step explanation:

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120 + 40 + x = 180

160 + x = 180

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Ulleksa [173]

<h2>Options A, B and C are correct choices. :) !!</h2>

Step-by-step explanation:

We have been given that Mael 15 ml of bleach with 3.75 liters of water to make a sanitizing solution for a daycare.

Let us see our given options one by one to find which could be combinations of volumes of bleach and water for Mael's sanitizing solution.

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A. 12 ml bleach and 3 liters of water.

We can see that both proportions are equal, therefore, option A is a correct choice.

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We can see that both proportions are equal, therefore, option B is a correct choice.

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3 years ago

The graph of $y=ax^2+bx+c$ passes through points $(0,5)$, $(1,10)$, and $(2,19)$. Find $a+b+c$.

MAVERICK [17]

Answer:

$a+b+c=10$

Step-by-step explanation:

We are given that the graph of the equation:

$y=ax^2+bx+c$

Passes through the three points (0, 5), (1, 10), and (2, 19).

And we want to find the value of (a + b + c).

First, since the graph passes through (0, 5), its y-intercept or c is 5. Hence:

$y=ax^2+bx+5$

Next, since the graph passes through (1, 10), when x = 1, y = 10. Substitute:

$(10)=a(1)^2+b(1)+5$

Simplify:

$5=a+b$

The point (2, 19) tells us that when x = 2, y = 19. Substitute:

$(19)=a(2)^2+b(2)+5$

Simplify:

$14=4a+2b$

This yields a system of equations:

$\begin{cases} 5 = a + b \\ 14 = 4a + 2b\end{cases}$

Solve the system. We can do so using elimination (or any other method you prefer). Multiply the first equation by negative two:

$-10=-2a-2b$

Add the two equations together:

$(-10)+(14)=(-2a+4a)+(-2b+2b)$

Combine like terms:

$4 = 2a$

Hence:

$a=2$

Using the first equation:

$5=(2)+b\Rightarrow b=3$

Therefore, our equation is:

$y=2x^2+3x+5$

Thus, the value of (a + b + c) will be:

$a+b+c = (2) + (3) + (5) = 10$

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3 years ago