Find the value of x. 128 (6x + 20

Can 4/3, 12/9 Form a proportion?

Rainbow [258]

Yes because they all have multiples of 3.
Also 4*3=12 and 3*3=9 so 4/3 is equal to 12/9.

6 0

3 years ago

-8 equals x + 11 / -2

slava [35]

If the equation is $-8=x+\frac{11}{-2}$ :

$-8=x+\frac{11}{-2}\\-8=x-\frac{11}{2}\\-8+\frac{11}{2}=x-\frac{11}{2}+\frac{11}{2}\\-\frac{16}{2}+\frac{11}{2}=x\\x=-\frac{5}{2}=-2\frac{1}{2}$

If the equation is $-8=\frac{x+11}{-2}$ :

$-8=\frac{x+11}{-2}\\-8(-2)=\frac{x+11}{-2}(-2)\\16=\frac{-2(x+11)}{-2}\\16=x+11\\16-11=x+11-11\\x=5$

Hopefully the math was self-explanatory. If it is not, please feel free to ask for a step-by-step, in depth explanation, and I will edit my answer to accommodate.

5 0

3 years ago

The ages of people entering a pie eating contest are normally distributed with a mean of 35 years and a standard deviation of 8.

ELEN [110]

Answer:

The ages of people entering a pie eating contest are normally distributed with a mean of 35 years and a standard deviation of 8.2 years.

What is the age of a pie eating contestant with a z-score of −2.1 ?

[ Age - 35 ] / [ 8.2] = -2.1 multiply both sides by 8.2

Age - 35 = -17.22 add 35 to both sides

Age ≈ 17.8 years

I am doing the test right now !!! ;P

3 0

3 years ago

Line passing through the points (2, 2) and (5, 8).

ololo11 [35]

The answer to the question

4 0

3 years ago

Solve the system of equations by graphing. Check the solution. y=-2x-3. y=2x+5. Graph each equation on the same coordinate plane

sammy [17]

Answer:

$\left \{ {{x=-2} \atop {y=1}} \right.$

Step-by-step explanation:

$\left \{ {{y=-2x-3} \atop {y=2x+5}} \right.$

Substitute into one of the equations
 $-2x-3=2x+5$

Rearrange variables to the left side of the equation
 $-2x-2x=5+3$

Combine like terms
 $-4x=5+3$

Calculate the sum or difference
 $-4x=8$

Divide both sides of the equation by the coefficient of variable
 $x=-\frac{8}{4}$

Cross out the common factor
 $x=-2$

Substitute into one of the equations
 $y=-2\times\left(-2\right)-3$

Calculate
 $y=1$

The solution of the system is
 $\left \{ {{x=-2} \atop {y=1}} \right.$

I hope this helps you! Don't forget to check the picture I uploaded as well

:)

7 0

2 years ago

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