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Andrews [41]
3 years ago
10

Lake Okeechobee’s water level was at sea level in April. In May, the lake’s level rose 4 inches and in June it rose 2 more inche

s. As a result of no rain, the lake’s level fell 5 inches in July and 3 more inches in August.
Select all the expressions that describe this situation.




4 – 5


4 + 2 – 5 – 3


4 + 2 – (5 – 3)


4 + 2 – (5 + 3)


4 + 2 – (– 5) – (– 3)


4 + 2 + (– 5) + (– 3)
Mathematics
1 answer:
Mice21 [21]3 years ago
7 0

Answer:

Just here for points XD.

Step-by-step explanation:

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Factorize (X + 2 y)square - (2 x minus y) square​
gulaghasi [49]

Answer:

- (x - 3y)(3x + y)

Step-by-step explanation:

Given

(x + 2y)² - (2x - y)² ← expand both parenthesis using FOIL

= x² + 4xy + 4y² - (4x² - 4xy + y²) ← distribute

= x² + 4xy + 4y² - 4x² + 4xy - y² ← collect like terms

= - 3x² + 8xy + 3y² ← factor out - 1 from each term

= - 1(3x² - 8xy - 3y²) ← factor the quadratic

Consider the factors of the product of the coefficient of the x² term and the coefficient of the y² term which sum to give the coefficient of the xy- term.

product = 3 × - 3 = - 9 and sum = - 8

The factors are - 9 and + 1

Use these factors to split the xy- term

3x² - 9xy + xy - 3y² ( factor the first/second and third/fourth terms )

= 3x(x - 3y) + y(x - 3y) ← factor out (x - 3y) from each term

= (x - 3y)(3x + y)

Thus

(x + 2y)² - (2x - y)² = - (x - 3y)(3x + y)

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3 years ago
Shawna is a member of the swim team. She can swim 3 laps in 3 minutes
likoan [24]

Answer:

8 mins 56 secs

Step-by-step explanation:

3 minutes and 21 seconds divided by 3 laps is 1.07 so it takes her 1 minute and 0.7 sec for each lap then u just multuply 1.07 by 8 and u get 8.56 meaning 8 mins and 56 secs. hope i helped :)

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Positive! I hope this helps!
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