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3. 1 what is 003064 expressed in standard form with two...

# Question: 1 what is 003064 expressed in standard form with two...

###### Question details

1 What is 0.03064 expressed in standard form with two significant figures? A 3.06 × 10−1

B 3.1 × 10−1

C 3.06 × 10−2

D 3.1 × 10−2

2 How long will it take to travel a distance of 140 km, travelling at an average speed of 105 km/h?

A 45 minutes

B 1 hour 15 minutes

C 1 hour 20 minutes

D 1 hour 33 minutes

3 The width of a book is measured to be 20 cm, correct to the nearest centimetre. What is the percentage error in this measurement?

A 0.25%

B 0.5%

C 2.5%

D 5%

4 Suppose 𝑦 = 3𝑥 − 5. When the value of increases x by 4, the value of y

A decreases by 4

B decreases by 5

C increases by 7

D increases by 12

5 A pool cleaner charges a call-out fee of $125 as well as$60 per half hour while working. Suppose the cleaner works for t hours. Which equation expresses the amount the cleaner charges ($C) as a function of time (t hours)? A 𝐶 = 60 + 125𝑡 B 𝐶 = 125 + 60𝑡 C 𝐶 = 120 + 125𝑡 D 𝐶 = 125 + 120𝑡 6 A car is depreciated using the declining-balance method with a rate of depreciation of 17% per annum. The car was bought for$30 000. What is the salvage value of the car after 4 years?

A $9600 B$14 237.50

C $15 763.50 D$20 400