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marin [14]
3 years ago
6

O

Mathematics
1 answer:
vichka [17]3 years ago
4 0

Answer:

4.) ET is perpendicular to plane BAT

Step-by-step explanation:

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What are the roots of x^2-4x+4?
Bezzdna [24]
The roots are just the zero value of the formula. To find these, we factor:

(x - 2)(x - 2)

(x - 2)^2

to make this into a zero, we set x-2 = 0, then solve for x

x = 2

If x = 2, then the brackets = 0, and those are the roots

The roots are x = 2

Leave a comment if you couldn’t understand, and I’ll try to answer.
3 0
3 years ago
Read 2 more answers
Can someone help me on 7,8, and 9 so confused
MArishka [77]

Step-by-step explanation:

all you have to do is multiply all those numbers together so 0.5 * 4.2 * 2.8 *7 =41.16

the process the exact same for all the other ones they have all your stuff set out for you on each one of the shapes

5 0
2 years ago
How to do both 14) and 16) b/c I have no idea. It is solving rational equations.
Vinvika [58]
Just like at any other time, to add/subtract fractions you need a common denominator.

14)

1/(x^2+2x)+(x-1)/x=1  so we need a common denominator of x(x^2+2x)

[1(x)]/(x(x^2+2x))+[(x-1)(x^2+2x)]/(x(x^2+2x))=[1(x(x^2+2x))]/(x(x^2+2x))

now if you multiply both sides of the equation by x(x^2+2x) you are left with:

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

x+x^3+2x^2-x^2-2x=x^3+2x^2

x^3+x^2-x=x^3-2x^2

x^2-x=-2x^2

3x^2-x=0

x(3x-1)=0, x=0 is an extraneous solution as division by zero is undefined. So the only real solution is:

x=1/3

...

16)

(r+5)/(r^2-2r)-1=1/(r^2-2r)  the common denominator we need r^2-2r so

[r+5-1(r^2-2r)]/(r^2-2r)=1/(r^2-2r), multiplying both sides by r^2-2r yields:

r+5-r^2+2r=1

-r^2+3r+5=1

-r^2+3r+4=0

r^2-3r-4=0

(r-4)(r+1)=0, r^2-2r cannot equal zero, r(r-2)=0, r cannot equal 0 or 2...

r=-1 or 4
8 0
3 years ago
What is the measure of secant dc​
harina [27]

Answer:

CD = 3

Step-by-step explanation:

Given 2 secants from an external point to the circle, then

CB × CA = CD × CE , that is

4 × (4 + 6.5) = CD × 14

4 × 10.5 = 14CD

42 = 14CD ( divide both sides by 14 )

CD = 3

4 0
3 years ago
Simplify:<br> 9x² - 4x - 3= [?]<br> X=-2
Bess [88]

Answer:

41

Step-by-step explanation:

Given x = -2,

Substitute x into the expression.9x^{2} -4x-3=9(-2)^{2} -4(-2)-3\\= 9(4)-4(-2)-3\\= 36+8-3\\=44-3\\=41

4 0
2 years ago
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