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lyudmila [28]
2 years ago
5

Which expression is equivalent to 2cos2(x/2)-cos(x)

Mathematics
1 answer:
Pavel [41]2 years ago
3 0

Answer:

B

Step-by-step explanation:

Edge

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Need help with 13 and 14
Svetach [21]

Answer:

13. A

14. C.

Step-by-step explanation:

A relation is a function if there is only one y assigned to each x.

That is if you have a set of points, there should be no repeated x value.

So looking at {(0,0),(-2,4),(-2,-4),(-3,7)} this is not a function because you have two x's that are the same. A.

The slope-intercept form of a linear equation is y=mx+b where m is the slope and b is the y-intercept.

The y-intercept is where the graph goes through the y-axis at.  It goes through at -1 so b=-1.

The slope is rise/run.  So starting from the y-intercept (0,-1) we need to find another point to count the rise & run to... How about (3,1)? That works.  You can do the counting if you want. You could also use the slope formula.

To use the slope formula, I just like to line the points up vertically and subtract vertically then put 2nd difference over the 1st difference.

(0,-1)

-(3,1)

--------

-3  -2

So the slope is -2/-3 or just 2/3.

So the equation is y=2/3 x-1

C.

3 0
2 years ago
Solve system by subsubstitution?<br> 14x-2y=46<br> -7x+y=-23
e-lub [12.9K]
14x-2y=46 \\&#10;-7x+y=-23 \\ \\&#10;\hbox{solve the 2nd equation for y:} \\&#10;-7x+y=-23 \\&#10;y=7x-23 \\ \\&#10;\hbox{substitute 7x-23 for y in the 1st equation:} \\&#10;14x-2(7x-23)=46 \\&#10;14x-14x+46=46 \\&#10;14x-14x=46-46 \\&#10;0=0 \\ \\&#10;\boxed{\hbox{infinitely many solutions}}
8 0
3 years ago
3 ft Find the outer perimeter of this figure. Round your answer to the nearest hundredth. Use 3.14 to approximate it. 4 ft 5 ft
Sedbober [7]

Answer:

perimeter = 19.42 ft

Step-by-step explanation:

perimeter of semi circle = 6π/2 = 9.42

perimeter of cone = 5 + 5 = 10

10 + 9.42 = 19.42 ft

7 0
2 years ago
Read 2 more answers
Estimate the sum of 299 and 388
Svetllana [295]

For this case we have the following numbers:

299

388

Let's round up each of the numbers to the nearest hundred,

We have then:

299 = 300

388 = 400

We note that now we have two numbers whose approximation is easier to add.

We have then:

300 + 400 = 700

Answer:

The sum of 299 + 388 is approximately:

700

7 0
3 years ago
Read 2 more answers
99 POINTS
yan [13]

Answer:

the function given f(x)=x^3

for 4 units up, just add 4 as a constant

4 units up means, every old value will now be 4 more than previous value. at x=0, y=0 in the transformed curse it should x=0 and y=4, so just add it.

f(x)=x^3+4

for 6 units left,

each old value of y should now occur 6 units before the old value of x i.e. X=x+6

for example, the point (0,0) should occur at (-6,0) in the transformed graph,

hence, f(x)=(x+6)^3

so the final curve is

f(x)=(x+6)^3+4

3 0
3 years ago
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