3 years ago

Which of the following expressions is equal to -3x^2-12??!!! please help him

Mathematics

1 answer:

Andreyy893 years ago

3 0

Answer:

-3 ( x+2i) (x-2i)

Step-by-step explanation:

-3x^2-12

Factor out a -3

-3(x^2 +4)

Rewrite

-3 ( x^2 - -4)

-3 ( x^2 - (-2i)^2) This is the difference of squares ( a^2 -b^2 ) = (a-b)(a+b)

-3 ( x- -2i) (x+2i)

-3( x+2i) (x-2i)

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svp [43]

Answer:

60.6°

Step-by-step explanation:

Using trigonometry :

Opposite = Height of shadow = 42 feets

Adjacent = height of flagpole = 23.7 feets

Tan θ = opposite / Adjacent

Tan θ = height of shadow / height of flagpole

Tan θ = 42 / 23.7

Tan θ = 1.7721518

θ = tan^-1(1.7721518)

θ = 60.56

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3 years ago

Tea costs $x a packets and coffee $y a packet. Five packets of tea and seven of coffee cost $39.40 while three packets of tea an

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Answer:

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Step-by-step explanation:

Let us represent

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5x + 7y = 39.40.....Equation 1

Three packets of tea and five of coffee cost $26.20.

3x + 5y = 26.20.......Equation 2

Combining both Equations

5x + 7y = 39.40.....Equation 1

3x + 5y = 26.20.......Equation 2

Multiply Equation 1 by 5 and Equation 2 by 7 to eliminate y

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Therefore, the cost of a packet of tea is $4.53

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3 years ago

Aye yall can ya help me pls ill give u brainlest as well but pls dont report or answer ignorant

arlik [135]

Answer:

6-A

Step-by-step explanation:

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