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kvasek [131]
3 years ago
10

PLEASE HURRY! 30 PTS! Which statements are true? SELECT EACH CORRECT ANSWERS! A.) 100x^3+5=5x^3(20x+1) B.)4x^2+10x=2x(2x+5) C.)3

0x^4−12x^3=6x^3(5x−2) D.)8x^3−6x=2x^3(4−3x^3)
Mathematics
2 answers:
Svet_ta [14]3 years ago
7 0

Answer:

B.)4x^2+10x=2x(2x+5)

Step-by-step explanation:

kirill [66]3 years ago
4 0

Answer:

B and C

Step-by-step explanation:

Distribute

4x^2 + 10x = 4x^2 +10x

30x^4 - 12x^3 = 30x^4 - 12x^3

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-2(5 + 6n) < 6(8 - 2n) solve for n
alexandr402 [8]

Answer:

All real numbers Interval Notation: (-∞,∞)

Step-by-step explanation:

Any value of n makes the inequality true.

Hope this helps.

8 0
2 years ago
Ok ok I know I’m gonna ask this again so please ( you do have to get me all the names btw ) I’ll give you brain list
Tomtit [17]

Answer:

                 1. quadrilateral

     2.   kite                  3.   trapezoid    

          4.     parallelogram      5.  isosceles trapezoid    

6.  rhombus   7.  rectangle

       8.  square            

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Show that cos2x=cosx
PSYCHO15rus [73]

cos (2x) = cos x

2 cos^2 x -1 = cos x   using the double angle formula

2 cos ^2 x -cos x -1 =0

factor

(2 cos x+1) ( cos x -1) = 0

using the zero product property

2 cos x+1 =0    cos x -1 =0

2 cos x = -1       cos x =1

cos x = -1/2       cos x=1

taking the arccos of each side

arccos cos x = arccos (-1/2)         arccos cos x = arccos 1

x = 120 degrees   x=-120   degrees           x=0

remember you get 2 values ( 2nd and 3rd quadrant)

these are the principal values

now we need to add 360

x = 120+ 360n      x=-120+ 360n      x = 0 + 360n  where n is an integer


3 0
3 years ago
Six years after a tree was planted, its height was 7 feet. Nine years after it was planted, its height was 16 feet. Which of the
pychu [463]
Considering that the grows at a constant rate we can form an equation where x = how many years after it was planted
and y = its height

Now we just need to find how many feet it grows each year. To do that we just need to compare its height from a certain age to another:
6 years after it was planted : 7 feet,
so x=6 and y = 7

9 years after it was planted: 16 feet
so x= 9 y=16

With thay we can conclude that in 3 years , the tree grew 9 feet. To discover how much the tree grow each year we just nee to divide 9 feet by 3 years which is 3 feet every year.

To write the equatopn now we just need to find the y-intercept which we can discover by setting x to 0:
If in 6 years after the tree was planted it is 7 feet long , we can discover how long it was when it was planted by subtracting 6 years of growth (The slope ) which is 3
7 - 6(years)×3(feet the tree grow each year)
7 - 18 = -11
The tree was -11 feet long when it was planted
which is our y-intercept
( I know it doesnt make sense , but if you apply to a graph it will make more sense )


Now we can make the equation
y = 3x -11
7 0
3 years ago
Please help me I have to turn in by 8:00
Diano4ka-milaya [45]

Answer:

A 2

Step-by-step explanation:

When we divide x by 9 there is some whole number we will call y plus a remainder of 4

x/9 = y  remainder 4

Writing this in fraction form

x/9 = y + 4/9

Multiplying each side by 9

9*x/9 = 9* y + 4/9 *9

x = 9y +4

Multiply each side by 2

2x = 2*(9y+4)

2x = 18y +8

Add 3 to each side

2x+3 = 18y +8+3

2x+3 = 18y +11

Divide each side by 9

(2x+3)/9 = 18y/9 +11/9

              = 2y + 9/9 +2/9

               =(2y+1 + 2/9)

  We know y is a whole number and 1 is a whole number so we can ignore 2y +1 when looking for a remainder)

2/9 is a fraction

Taking this back from fraction form to remainder from

                 (2y+1) remainder 2

7 0
3 years ago
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