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3 years ago

14

1. Which expression is equivalent to (y + 7) - (-8y + 14)?

1 answer:

zimovet [89]3 years ago

5 0

Answer:

A

Step-by-step explanation:

(y + 7) - (-8y + 14) = y + 7 + 8y - 14 = 9y - 7

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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

3 0

3 years ago

Find the real numbers x and y that make the equation true (x+6i)=(3-i)+(4-2yi)

Ronch [10]

Answer:

x = 7

y = -7/2

Step-by-step explanation:

(x+6i)=(3-i)+(4-2yi)

First look at the real parts

x = 3 +4

x = 7

Then look at the imaginary part

6i= -i -2yi

6 = -1-2y

Add 1 to each side

6+1 = -2y

7 = -2y

Divide by -2

7/-2 = y

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4 years ago

Sean drank 2 liters of water today which was 280 milliliters more than he drank yesterday. How much water did he drink yesterday

BigorU [14]

2000mL - 280mL = 1720mL or 1.72L

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3 years ago

Maria ran 17 miles at an average speed of 5 miles per hour. Use function notation to write an equation that gives the total dist

ohaa [14]

Answer:

f(t) = 5t

Step-by-step explanation:

distance = speed × time

d = st Insert value of speed

d = 5t

In function notation,

f(t) = 5t

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3 years ago

What is a+ a/5+ 2/5a

Galina-37 [17]

Answer:

8a over 5

Hope this helps :)

Step-by-step explanation:

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3 years ago