Make a the subject get a on its own x(a+2)=7

2 answers:

7 0

X (a + 2) = 7

First let's multiply out the brackets on the left side of the equation.
x (a + 2) --> Multiply everything inside the brackets by x.
xa + 2x = 7

Now, both elements of the left-hand side of the equation contain x, so we can divide both sides of the equation by x.

xa + 2x = 7
a + 2 = 7/x

To find a now, just subtract 2 from both sides.
a = 7/x - 2

Soloha48 [4]4 years ago

3 0

X(a + 2) = 7

Divide both sides by x.

x(a + 2) / x = 7 / x

(a + 2) = (7/x)

a = (7/x) - 2

Hope this explains it.

You might be interested in

an item that costs $50 is marked 20% off. sales tax for the item is 8%. What is the final price, including tax

Sphinxa [80]

$Marking\ off:\ 50-20\%*50=50-0.2*50=50-10=40\$\\\\
Tax:\ 40\$+8\%*40=40+0.08*40=40+3.2=43.2\$\\\\
Final\ price\ is\ 43.2\$.$

4 0

3 years ago

(2/3) / (-1/2)<br> How do I divide these 2 fractions?

dsp73

Answer:

Step-by-step explanation:

2/3*(-2/1)

$-\frac{4}3}$

Hope it helps! Please mark Brainliest if it does!

4 0

3 years ago

Read 2 more answers

Jennifer serves the volleyball to Marsha with an upward velocity of 10.5 ft/s. The ball is 5 feet above the ground when she stri

Katarina [22]

Answer:

0.98 seconds

Step-by-step explanation:

We assume the height of the volleyball is described by the equation for ballistic motion. We want to find the time it takes for the height to become zero.

<h3>motion equation</h3>

The general form of the equation of height for ballistic motion is ...

$h(t)=-16t^2+v_0t+h_0\qquad\text{$v_0$ and $h_0$ are the initial velocity and height}$

The coefficient 16 in the equation is an approximation of 1/2g, where g is the acceleration due to gravity in ft/s². This means the units of time and distance are expected to be seconds and feet.

For the problem at hand, the initial velocity and height are 10.5 ft/s and 5 ft. Then the height equation is ...

h(t) = -16t² +10.5t +5

<h3>reaction time</h3>

Marsha has until the ball hits the ground to react to the serve. To find out how long that is, we need to solve the height equation for t when h=0. This is most easily done using the quadratic formula with ...

a = -16
b = 10.5
c = 5

The solution is ...

$t=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}= \dfrac{-10.5\pm\sqrt{10.5^2-4(-16)(5)}}{2(-16)}\\\\=\dfrac{10.5\pm\sqrt{430.25}}{32}=\dfrac{21\pm\sqrt{1721}}{64}$

The positive solution is ...

t ≈ 0.976327 ≈ 0.98

Marsha has about 0.98 seconds to react before the volleyball hits the ground.

_____

<em>Additional comment</em>

After about 0.33 seconds, Marsha knows she doesn't need to react at all. The serve will not clear the net. Its maximum height is about 6' 8 5/8". A women's volleyball net is 7' 4 1/8" high. Jennifer's serve velocity must be at least 12.3 ft/s for the ball to go over the net. With that upward velocity, Marsha has about 1.06 seconds to react.