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3 years ago

Question 5 of 24

Mathematics

1 answer:

Masja [62]3 years ago

7 0

I think that the answer is c

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When the solution of x2 − 9x − 6 is expressed as 9 plus or minus the square root of r, all over 2, what is the value of r? x equ

jarptica [38.1K]

Answer:

r = 105

Step-by-step explanation:

Given quadratic equation:

x² − 9x − 6

Quadratic formula is given by:

(-b ± √b² - 4ac) ÷ 2a

For the equation: x² - 9x - 6

a = 1, b = -9 and c = -6

Substitute in the quadratic formula:

(-b ± √b² - 4ac) ÷ 2a

(-(-9) ± √(-9)² - 4(1*-6)) ÷ 2*1

= 9 ± √105 / 2

The solution of x² − 9x − 6 is expressed as 9 plus or minus the square root of r, all over 2

Therefore, the value of r is 105

4 0

3 years ago

PLEASE HELP! WILL GIVE 70 POINTS!!

Tresset [83]

Answer:

$A=189\ mm^2$

Step-by-step explanation:

Surface Areas

Is the sum of all the lateral areas of a given solid. We need to compute the total surface area of the given prism. It has 5 sides, two of them are equal (top and bottom areas) and the rest are rectangles.

Computing the top and bottom areas. They form a right triangle whose legs are 4.5 mm and 6 mm. The area of both triangles is

$\displaystyle A_t=2*\frac{b.h}{2}=b.h=(4.5)(6)=27 mm^2$

The front area is a rectangle of dimensions 7.7 mm and 9 mm, thus

$A_f=b.h=(7.5)(9)=67.5 \ mm^2$

The back left area is another rectangle of 4.5 mm by 9 mm

$A_l=b.h=(4.5)(9)=40.5 \ mm^2$

Finally, the back right area is a rectangle of 6 mm by 9 mm

$A_r=b.h=(6)(9)=54 \ mm^2$

Thus, the total surface area of the prism is

$A=A_t+A_f+A_l+A_r=27+67.5+40.5+54=189\ mm^2$

$\boxed{A=189\ mm^2}$

4 0

3 years ago

Which is the simplified form of the expression ((2⁻³)(x⁻³)(y²)/(4⁻²)(x⁴)(y⁶))²?

Vesna [10]

Answer :

${4x}^{2} {y}^{16}$
Answer choice B.

8 0

3 years ago

Evaluate the function for f (2) = x^3 - 2 A.4 B.6 C.8 D.10

ElenaW [278]

Answer:

A. 4

Step-by-step explanation:

Hope this helps!

5 0

3 years ago

Read 2 more answers

Distribute a negative -(5.5q+7)

Ipatiy [6.2K]

Hi there! :)

Answer:

$\huge\boxed{-5.5q - 7}$

-(5.5q + 7)

Distribute:

-(5.5q) -(7)

-5.5q - 7

7 0

3 years ago

Read 2 more answers