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3 years ago

Plzzzzzzzzzzzzzzzzzzzzzzzzz help it really hard

Mathematics

1 answer:

dexar [7]3 years ago

3 0

Answer:

168 cm.

Step-by-step explanation:

If each book has an equal distance of 12 cm and total books are (20-6) = 14

then, total distance is (12*14) = 168.

I hope this is correct. Feel free to correct me if I'm wrong.

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What is the end behavior of the function f(x) = 3x4−x3 + 2x2 + 4x + 5? (1 point)

ELEN [110]

Answer: both the left and right sides go to +∞

Step-by-step explanation:

End behavior can be determined by two things:

Sign of the leading coefficient
Degree of the function

Sign of leading coefficient:

positive: right side goes to +∞

negative: right side goes to -∞

⇒ Leading coefficient of this function is 3 so the right side goes to +∞

Degree (exponent of leading coefficient):

even: both the left and right sides point in the SAME direction

odd: the left and right sides point in OPPOSITE directions

⇒ Degree of this function is 4 so the left side will point in the same direction as the right side.

8 0

3 years ago

HELP ASAP TIMED !!!! What is the exact value of cos(c + d), given Sine c = StartFraction 24 Over 25 EndFraction for c in Quadran

Keith_Richards [23]

9514 1404 393

Answer:

Step-by-step explanation:

In the second quadrant, ...

c = 180° -arcsin(24/25) ≈ 106.26°

In the third quadrant, ...

d = 360° -arccos(-3/4) ≈ 221.41°

Then cos(c+d) = cos(327.67°) ≈ 0.84498

This is a positive irrational number, greater than 21/100, so the only reasonable choice is the last one:

$\dfrac{21+24\sqrt{7}}{100}\approx 0.84498$

_____

Perhaps you want to work this out using the trig identities.

cos(c) = -√(1 -sin(c)²) = -7/25

sin(d) = -√(1 -cos(d)²) = -(√7)/4

Then the desired cosine is ...

cos(c+d) = cos(c)cos(d) -sin(c)sin(d)

cos(c+d) = (-7/25)(-3/4) -(24/25)(-√7/4)

cos(c+d) = (21 +24√7)/100 . . . . matches choice D

8 0

2 years ago

Find the area of the shaded region.

Ghella [55]

This is a rhombus and in any rhombus, the diagonals intersects in the middle and they are perpendicular:
So all 4 triangles are right triangles and the sides are the hypotenuses.
1st) Calculate the sides: hypotenuse² = 3² + 4² = 25, and hypotenuse = 5

The area of each right triangle is (4 x 3)/2 = 6 units²
And the area of the 4 right triangles = 4 x 6 = 24 init²

4 0

3 years ago

Simply the expression-2.3(4r+5)-3.6r

laiz [17]

Answer:

Step-by-step explanation:

you need to cancel out the brackets by multiplying -2.3 with every thing inside the brackets

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3 years ago

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Which does not show a direct variation between x and y?

butalik [34]