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Keith_Richards [23]
4 years ago
12

Can I please have help on number six?

Mathematics
2 answers:
HACTEHA [7]4 years ago
6 0
I really don’t know but I know you
daser333 [38]4 years ago
6 0

The answer is -60.5. Hope this helps!

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Using the identity cos(2x) = 2 cos^2x - 1
18 + 9(2 cos^2 x - 1) = 27 cos x
18cos^2 x - 27 cos x + 9 = 0
2 cos^ x - 3 cos x + 1 = 0

(2 cos x  - 1 )(cos x  - 1 ) = 0

cos x = 1/2 , 1 

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4 0
3 years ago
laptop has a listed price of $879.95 before tax. If the sales tax rate is 8.5%, find the total cost of the laptop with sales tax
Black_prince [1.1K]

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3 years ago
Plot the axis of symmetry and the vertex for this function: h(x) = (x − 5)2 − 7.
jeka94

Answer:

The vertex and the axis of symmetry in the attached figure

Step-by-step explanation:

we know that

The equation of a vertical parabola written in vertex form is equal to

f(x)=a(x-h)^2+k

where

a is the leading coefficient

(h,k) is the vertex of the parabola

and the equation of the axis of symmetry is equal to the x-coordinate of the vertex

x=h

In this problem

we have

h(x)=(x-5)^2-7

This is a vertical parabola written in vertex form open upward

The vertex is a minimum

where

the vertex is the point (5,-7)

the x-coordinate of the vertex is 5

so

the equation of the axis of symmetry is equal to

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The graph in the attached figure

7 0
3 years ago
15m+9n=-6 solve for n
Yanka [14]

Answer:

( - 2 - 5m ) / 3

Step-by-step explanation:

15m + 9n = - 6

9n = - 6 - 15m

Divide by 3 on both sides,

9n / 3 = - 6 / 3 - 15m / 3

3n = - 2 - 5m

n = ( - 2 - 5m ) / 3

3 0
2 years ago
Read 2 more answers
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ioda

Answer is c

199.95 x 25/100

=49.9875

Sale price

=199.95-49.9875

=149.9625

=149.96

5 0
3 years ago
Read 2 more answers
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