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3 years ago

7a+(4+5a)=12a+4 use properties and justify each step

1 answer:

3 0

7a+(4+5a)=12a+4

The first step to this is to simplify both sides of the equation.

You have to combine all of the like terms first...
(7x + 5x) + (4) = 12x + 4
12x + 4 = 12x + 4

Now the second step is to subtract 12x from both sides....
12x + 4 = 12x + 4
-12x -12x

4 = 4

Now you will subtract four from both sides and get....

0=0

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The cost of a set of DVDs after a 35% mark up can be represented by the expression b + 0.35b. Simplify the expression.

Anika [276]

Answer:

35%/5 = 7 b=7 7 + 35x7= 966 / 21 = 46

Step-by-step explanation:

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3 years ago

An element with mass 570 grams decays by 26.9% per minute. How much of the element is remaining after 14 minutes, to the nearest

Lina20 [59]

Answer:

element remained after 14 minutes = = 7.091 g =~ 10 g

Step-by-step explanation:

After every minute the amount remained will be

(100 - 26.9 ) % i.e. 73.1 %

which is 0.731 times as much as the amount was at the start.

if the number of minutes passed is represented by t the function f(t) represents the mass of element remaining our equation will be

f(t) = 570( 0.731) ^ t

t= 14 minutes

f(14) = 570 ( 0.731) ^ 14

= 7.091 g =~ 10 g

8 0

3 years ago

Read 2 more answers

Which table of values is correct for the equation y = -x + 3.

babunello [35]

Answer:

This is the only answer I could think of to give you

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

If the surface area of a sphere is 530.93 square cntimeters, find the volume of the sphere

hodyreva [135]

The volume of sphere is: 1149.76\ cm^3

Further explanation:

We have to find the radius of the sphere first to find the volume of sphere

Given

Surface Area of Sphere=530.93 cm^2

$SA=4\pi r^2\\530.93=4*3.14*r^2\\530.93=12.568r^2\\r^2=\frac{530.93}{12.56}\\r^2=42.27\\Taking\ Square\ root\ on\ both\ sides\\\sqrt{r^2}=\sqrt{42.27}\\r=6.5\ cm\\Now,\\V=\frac{4}{3}\pi r^3\\V=\frac{4}{3}*3.14*(6.5)^3\\=\frac{4}{3}*3.14*274.625\\=1149.76\ cm^3$

The volume of sphere is: 1149.76\ cm^3

Keywords: Sphere, Volume of sphere

Learn more about spheres at:

#LearnwithBrainly

6 0

3 years ago

Find the value of x so that the function has the given value. r(x)=−45x+7; r(x)=−5

Mama L [17]

Answer:

x = 3

Step-by-step explanation:

j(x) = 4/5(-5) + 7

= -4 + 7

= 3

6 0

3 years ago