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Likurg_2 [28]
3 years ago
13

Find the product 2x(-8)x(-9) A. 19 B. -19 C. 144 D. -144

Mathematics
2 answers:
ratelena [41]3 years ago
5 0
2 x -8 x -9 
2x-8 =-16
-16 x -9 = 144
so your answer is C
MrMuchimi3 years ago
5 0
-8 times -9 = 72

72 times 2 = 144
 
it's c
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DESPERATE FOR EXPLANATION PLEASE HELP
Hitman42 [59]

This one is the Law of Sines again.


The Law of Sines relies on the standard labeling of triangle ABC with vertices A, B, and C and respective opposite sides of a, b and c. Then


\dfrac{a}{\sin A} = \dfrac{b}{\sin B} = \dfrac{c}{\sin C}


Here we have A=150 degrees (opposite side a), b= 10 cm and B = 12 degrees. We seek a.


So we need the first equation of the Law of Sines:


\dfrac{a}{\sin A} = \dfrac{b}{\sin B}


a = \dfrac{b \sin A }{\sin B}


a = \dfrac{10 \sin 150}{\sin 12} \approx 28.0


7 0
3 years ago
The path of a projectile launched from a 20-ft-tall tower is modeled by the equation y = -5x2 + 40x + 20. What is the maximum he
Otrada [13]

Answer:

30.49 m

Step-by-step explanation:

To obtain the maximum height, we solve for the value x when dy/dx = 0.

Since, y = -5x² + 40x + 20

dy/dx = d[-5x² + 40x + 20]/dx

dy/dx = -10x + 40

Since dy/dx = 0,

-10x + 40 = 0

-10x = -40

x = -40/-10

x = 4

Substituting x = 4 into the equation for y, we have

y = -5x² + 40x + 20

y = -5(4)² + 40(4) + 20

y = -5(16) + 160 + 20

y = -80 + 160 + 20

y = 80 + 20

y = 100 ft

Since y is in feet, we convert to meters.

Since 1 m = 3.28 ft, 100 ft = 100 ft × 1 m/3.28 ft = 30.49 m

So, the maximum height, in meters  reached by the projectile is 30.49 m

3 0
3 years ago
Find the reciprocal of the number
SOVA2 [1]

Answer:

To find the reciprocal of a fraction all you need to do is flip it upside down.

I don't know what you mean but if it's 18/7 the reciprocal would be 7/18.

If it's a whole number (so just 18) convert it to an improper fraction (so 18/1) and then flip it. (1/18.)

7 0
3 years ago
For what value(s) of x is the fraction 5x-10/x^2-25 undefined?
EleoNora [17]

Answer:

+5 or -5.

Step-by-step explanation:

Given equation,

5x-10/x^2-25

When you divide something with zero, it becomes undefined. So, to be undefined, x will have to be that value which makes the divisor zero.

Now,  x^2-25= 0

Or, x^2= 25

Or, x= +5,-5.

So, for the value +5 and -5, the divisor becomes zero and makes the whole equation undefined.

8 0
3 years ago
What is the value of x?
rewona [7]

Vertical angles are equal

so

4x + 7 = 5(x - 4)

4x + 7 = 5x - 20

5x - 4x = 7 + 20

x = 27

5 0
3 years ago
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