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2 years ago

Help please.............................................

Mathematics

2 answers:

frozen [14]2 years ago

8 0

Answer:

Second option

$( - 7x + 4)( - 7x - 4)$

Step-by-step explanation:

If you multiply it out you get:

$49 {x}^{2} + ( - 7x \times - 4) + ( - 7x \times 4)- 16$

The two middle terms cancel out because of the sign difference of the two fours.

Result:

$49 {x}^{2} - 16$

Difference of squares. If the two multiplied brackets look exactly the same except for a sign difference in one of the terms (4 in this case) it is difference of squares.

BaLLatris [955]2 years ago

5 0

Answer:

Step-by-step explanation:

(-7x + 4)(-7x - 4)

= 49x^2 - 28x + 28x - 16

= 49x^2 - 16.

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Answer:

y = 3 - x + x²

Step-by-step explanation:

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3 years ago

How many days will it take for a sum of $4,000 to earn $80 interest if it is deposited in a bank paying ordinary simple interest

Maksim231197 [3]

Answer:

It will take 146 days to earn an interest of $80.

Step-by-step explanation:

The simple interest formula is:

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Compute the time required as follows:

$I=\frac{P\times r\times t}{100}$

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2 years ago

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3 years ago

An air traffic controller is tracking two planes.To start Plane A was at an altitude of 990 meters and plane B was at an altitud

soldi70 [24.7K]

The equation representing when the two planes would be at the same altitude is 9x=486

<h3>In terms of mathematics, what is an equation?</h3>

Equation: A declaration that two expressions with variables or integers are equal. In essence, equations are questions, and attempts to systematically identify the solutions to these questions have been the driving forces behind the creation of mathematics.

From (a) we get that: Altitude of Plane A = 990-18x

Altitude of Plane B = 1476-27x

make 890 - 18x = 1476-27x

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9x=486

X= 54

so pass 54 seconds will the two plane at the same altitude.

To learn more about equations from given link

brainly.com/question/25678139

#SPJ9

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