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Natalija [7]
3 years ago
6

Solve. 50 + -20 - 6x x represents 7.

Mathematics
1 answer:
tiny-mole [99]3 years ago
8 0

Answer:

-12

Step-by-step explanation:

50 + -20 - 6x

First combine like terms

30 -6x

Then let x=7

30 -6(7)

30 -42

-12

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The last one D because it is rational
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Please help geometry
maxonik [38]

Answer:

(1,2)

Step-by-step explanation:

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Explain the steps necessary to convert a quadratic function in standard form to vertex form
SIZIF [17.4K]

Answer:

See below.

Step-by-step explanation:

Here's an example to illustrate the method:

f(x) = 3x^2 - 6x + 10

First divide the first 2 terms by the coefficient of x^2 , which is 3:

= 3(x^2 - 2x) + 10

Now  divide the -2 ( in -2x) by 2 and write the x^2 - 2x in the form

(x - b/2)^2 - b/2)^2  (where b = 2) , which will be equal to x^2 - 2x in a different form.

= 3[ (x - 1)^2 - 1^2 ] + 10 (Note: we have to subtract the 1^2 because (x - 1)^2 = x^2 - 2x  + 1^2  and we have to make it equal to x^2 - 2x)

= 3 [(x - 1)^2 -1 ] + 10

= 3(x - 1)^2 - 3 + 10

= <u>3(x - 1)^2 + 7 </u><------- Vertex form.

In general form the vertex form of:

ax^2 + bx + c  = a [(x - b/2a)^2 - (b/2a)^2] + c .

This is not easy to commit to memory so I suggest the best way to do these conversions is to remember the general method.

3 0
3 years ago
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Write a expression that is equivalent of 4+3(5+x)
Serggg [28]

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Step-by-step explanation:

4+3(5+x)

Open bracket

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3 0
3 years ago
A straw has a diameter of 0.6cm and a length of 19.5 cm. What is the surface area of the straw round to the nearest tenth. Use 3
Nadusha1986 [10]

Answer:

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Step-by-step explanation:

Given data

Diameter= 0.6cm

Radius= 0.3cm

Lenght = 19.5cm

Surface area (A) =2πrh+2πr^2

Substitute

A=2*3.14*0.3*19.5+2*3.14*0.3^2

A=36.738+0.5652

A=37.3032

Hence the surface area is

37.3032cm^2

6 0
3 years ago
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