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2 years ago

Solve solve the following equations 2x (x minus 5) close + 3(x-2)=8+7(x-4)

Mathematics

1 answer:

stiv31 [10]2 years ago

7 0

Step-by-step explanation:

2x(x-5)+3(x-2)=8+7(x-4)

2x²-10x+3x-6=8+7x-28(Group like terms)

2x²-10x+3x-7x=8-28+6

2x²-7x-7x=-20+6

2x²-14x=-14(Divide both sides by -14)

2x²-x=1

2x=1

x=½

Hope you get it please someone should verify....

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Marcus spent 3.25$ to wash his car. If one querter operates the car wash 60 seconds hiw long did it take him to wash his car.

ddd [48]

Answer:

answer=answer

Step-by-step explanation:

Y E S

I love simple math.

3.25$ to wash the car.

60 seconds: 1 quarter

how many quarters is 3.25?

4 quarters per dollar. so it'd be 13 quarters, then do 13*60=how many seconds u got. 780 seconds. I think you can do 780/60

HINT: hey, psst, it's 13 minutes. : D

HEY DOn'T teLL tHeM tHe ANSWER. :V

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3 years ago

If an exterior angle of a regular polygon is 21.2Â°, how many sides does the polygon have?

sesenic [268]

360 divided by x = 21.2 recurring
So rearrange that to get x = 360 divided by 21.2
Which rounds up to 17

3 0

3 years ago

A hypothetical square grows so that the length of it's diagonals are increasing at a rate of 8 m/min. How fast is the area of th

guapka [62]

Answer:

32 $m^{2}/min$

Step-by-step explanation:

We let the length of the square be l, the diagonal be z and the area be A.

Then by Pythagoras theorem;

$l^{2}+l^{2}=z^{2}\\2l^{2}=z^{2}$

The are of a square of length l is given as;

$A=l^{2}$

Combining these two equations yields;

$z^{2}=2A$

$A=\frac{z^{2} }{2}$

Next, we have been given;

$\frac{dz}{dt}=8$

We are required to find;

$\frac{dA}{dt}$ when z = 4

By chain rule;

$\frac{dA}{dt}=\frac{dA}{dz}*\frac{dz}{dt}$

Differentiating $A=\frac{z^{2} }{2}$ with respect to z yields;

$\frac{dA}{dz}=z$

Therefore,

$\frac{dA}{dt}=\frac{dA}{dz}*\frac{dz}{dt}$ = 8z

When z is 4m the area of the square will be increasing at a rate of;

8m/min * 4m = 32 $m^{2}/min$

5 0

3 years ago

Yx + a = b solve for y.

Marat540 [252]

Answer:

y=b-a/x

Step-by-step explanation:

yx+a=b

-a

yx=b-a/x

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2 years ago

Sam worked 8.4 hours each day for 7 days. How many hours did he work altogether?

BartSMP [9]

Answer:

58.8

Step-by-step explanation:

8.4 x 7= 58.8

you ould also think of it like 8x7.

then 4 x7 and then move the decimal right one to make it a smaller number

3 0

2 years ago

Solve solve the following equations 2x (x minus 5) close + 3(x-2)=8+7(x-4)​

Solve solve the following equations 2x (x minus 5) close + 3(x-2)=8+7(x-4)