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My name is Ann [436]
3 years ago
10

Factorise the following algebraic expressions completely a. y4 −81 . x2 +10x +24

Mathematics
1 answer:
Ludmilka [50]3 years ago
3 0

y^4-81=(y^2-9)(y^2+9)=(y-3)(y+3)(y^2+9)\\\\
x^2 +10x +24 =x^2+10x+25-1=(x+5)^2-1=(x+5-1)(x+5+1)=(x+4)(x+6)

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Simplify 2.67 + (−8.9).
OlgaM077 [116]

Answer:

-6.23 is the answer

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1 year ago
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The 7 a.m. flight from Dallas to Chicago is on time 75% of the time. Fran created this spinner to simulate the scenario. Fran sp
damaskus [11]

Answer:

Choice C; The flight will be late on one of the three days.

Step-by-step explanation:

The flight is 75% of the time. This means that out of 4 flights, 3 are on time and  the result of Franc's spinner should reflect this fact, i.e his spinner should give 75% probability of flights on time.

Choice A says the flight is on time 0% of the time, This is not true, therefore this is not a correct interpretation of the three spins.

Choice B says the flight is on time 100% of the time, This is not true, therefore this is not a correct interpretation of the three spins.

Choice C says the flight is on time 66% of the time, which is close to 75%. Therefore this choice is close and correct.

Choice D says the flight is on time 30% of the time, This is not true, therefore this is not a correct interpretation of the three spins.

Thus only choice C is correct.

7 0
3 years ago
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Which of the following describes an example of mutually exclusive outcomes A and B for throwing a single 6-sided
swat32
Answer:
A=the outcome is odd, B=the outcome is even
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5 0
2 years ago
Person A can paint the neighbor's house 5 times as fast as Person B. The year A and B worked together, it
LenKa [72]

Answer:

Person A paints the house in 12 days.

person B paints the house in 60 days.

Step-by-step explanation:

The together rate is the sum of each separate rate.

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This means that the rate of person A is 1/x, and the rate of person B is 1/5x.

The year A and B worked together, it took them 10 days.

This means that:

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Multiplying everything by 10x

10 + 2 = x

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This means that:

Person A paints the house in 12 days.

person B paints the house in 60 days.

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3 years ago
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The answer is d) none because substituting -1/4x + 5/3 for y in the first equation gives 3x - 3x + 5/3 = 20 so 5/3 = 20 which is not true. 
8 0
3 years ago
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