3 years ago

Simplify.

Mathematics

1 answer:

Anarel [89]3 years ago

5 0

Answer:

3x^5 - 4x^4 - 5x^3 + x^2 + 11x - 6

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Use pi=3 calculate the length of a cicumference of a circle with a radius of 5cm

8_murik_8 [283]

Circumference=2pir
r=5
pi=3
circumference=(2)(3)(5)
circumfernce=6(5)
circufmerence=30

answer is 30cm

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3 years ago

A teacher has 40 learners in her class. She chooses 1% to clean her board. Is this possible?

worty [1.4K]

Step-by-step explanation:

No, 1% of 40 is the same as 40% of 1. Which is 0.025% You cant have 0.025% of a learner or a human so this isn't possible.

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3 years ago

If m angle RTS = 8x + 18, find x so that line TR is perpendicular to line TS

Kitty [74]

Answer:

Point T is the right angle of the triangle, so RTS = 90 degrees

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Step-by-step explanation:

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3 years ago

A hairdryer transfers 36,000J in one minute, what is the power rating of the hairdryer?

Verdich [7]

Answer:

1. 600 watts

2. 35640 J

3. 55%

4. 20 J

5. The cost of running the fire is 8p.

Step-by-step explanation:

1. Energy = 36 000 J , t = 1 minute = 60 seconds

Power = $\frac{energy}{time}$

= $\frac{36000}{60}$

= 600 watts

2. Power = $\frac{work done}{time}$

⇒ work done = Power × time

= 99 × 360

= 35640 J

3. Efficiency = (Output / Input) × 100

= $\frac{55}{100}$ × 100

= 55%

4. Work done = Force × distance

= 5 × 4

= 20 J

5. Given that 1 KWh cost 2p, Power = 4 KW and time = 4 hours.

Power = $\frac{energy}{time}$

Energy = Power × time

= 4 × 4

= 16 KWh

The cost of running the fire = $\frac{16}{2}$

= 8p

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3 years ago

A bag of marbles has 5 blue marbles, 3 red marbles, and 6 yellow marbles. A marble is drawn from the bag

kati45 [8]

Answer:

Step-by-step explanation:

answer is 14 trust me

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3 years ago