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3 years ago

I NEED HELP IM LATE PLEASE

Mathematics

1 answer:

Inga [223]3 years ago

3 0

Answer:

9x, 8x+12

Step-by-step explanation:

x(2x+7)-2x(x-1)

=> 9x

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Help me!! Please anything helps.

Degger [83]

The answer is C, a function is when the x value does NOT repeat!

6 0

3 years ago

Dan bought a soft drink for four dollars and four candy bars. He spent a total of sixteen dollars. How much did each candy bar c

MariettaO [177]

For each candy bar it would be 3 dollars each so
The four candy bars are a total of 12$ it self plus the 4 dollars for the soft drink so 12+4 is 16
So 3$ each candy bar

5 0

4 years ago

Two quantities are related, as shown in the table:

Rashid [163]

Answer:

$y = \frac{1}{2} x + 2$ .

Step-by-step explanation:

From the given table it is clear that x and y are linearly related.

Now, any two points that satisfy the relation between x and y are sufficient to express the equation.

The first two given points are (2,3), and (4,4).

Therefore, the equation is $\frac{y - 4}{4 - 3} = \frac{x - 4}{4 - 2}$

⇒ $y - 4 = \frac{1}{2} (x - 4)$

⇒ $y - 4 = \frac{1}{2} x - 2$

⇒ $y = \frac{1}{2} x + 2$ . (Answer)

6 0

3 years ago

What value of a makes the equation true a/45=6/9

Jet001 [13]

45÷9=5 So then 6x5=30 A=30

5 0

3 years ago

Read 2 more answers

Postal regulations specify that a parcel sent by priority mail may have a combined length and girth of no more than 126 in. Find

Zarrin [17]

Answer:

The package of maximum dimensions has:

Width and height = 21 in each , and length = 42 in

Step-by-step explanation:

A package of square cross section has a girth equal to the perimeter of the square ("4 x" if we consider "x" as the side of the square). This quantity, added to the package's length "L" has to be no more than 126 in.

The maximum allowed for priority mail is therefore: $4x+L=126 \,in$

At the same time, we want the volume of the package to be a maximum. The volume of this parcel is defined as the product of all three dimensions of the package:

$V=width\,*\,height\,*\,length\\V=x\,*\,x\,*\,L\\V=x^2\,L$

We can now use the first formula for the priority mail maximum dimensions, to write L in terms of "x" and replace it in the volume formula:

$4x+L=126 \,in\\L=126-4x$

So now the volume expression becomes:

$V=x^2\,(126-4x)=126x^2-4\,x^3$

If the student doesn't know calculus, a graphing tool can be used to find the maximum.

With calculus derivatives the maximum can be easily found:

We can request the derivative of the volume to satisfy the conditions for derivative = 0 and the function concave down to locate the function's "maximum".

$V'(x)=252\,x-12\,x^2\\0=252\,x-12\,x^2\\0=12\,x\,(21-x)$

This tells us that there are two solutions to the derivative equal zero:

$x=0\,\,and\,\,x=21$

The first solution is clearly a minimum since it would render a package of zero volume. the second solution ( $x=21$ ) is the one that corresponds to the maximum of the volume function.

Therefore, the dimensions of the package of largest volume are: width and height: 21 in each, and length L= 126 - 4*21 = 42 in

8 0

3 years ago