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Elza [17]
3 years ago
8

4-x suare= -16 what is the answer

Mathematics
2 answers:
Snowcat [4.5K]3 years ago
7 0

4-x^2=-16\\\\
x^2=20\\\\
x=\sqrt{20} \vee x=-\sqrt{20}\\\\
x=2\sqrt5 \vee x=-2\sqrt5

chubhunter [2.5K]3 years ago
7 0

x = ± 2√5

subtract 4 from both sides

- x² = - 16 - 4 = - 20

multiply both sides by ( - 1)

x² = 20

Take the square root of both sides

x = ± √20 ( note plus or minus)

x = ± √4 ×  5 = ± √4 × √5 = ± 2√5



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A press release describing the 1986 nonstop, round-the-world trip by the aircraft voyager including the following data:
adoni [48]

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Step-by-step explanation:

A press release describing the 1986 nonstop, round-the-world trip by the aircraft voyager including the following data:

flight distance: 25,012 miles

flight time: 9 days, 3 min., 44 seconds

fuel capacity: nearly 9000 lbs.

fuel remaining at the end of flight: 14 gal.

To the maximum number of significant figure permitted, calculate:

a.) the average speed of the aircraft in miles per hour

Step 1

We convert the time to hours

flight time: 9 days, 3 min., 44 seconds

1 day = 24 hours

9 days =

24 × 9

= 216 hours

60 mins = 1 hour

3 mins =

3/60 = 1/20 = 0.05 hours

1 hour = 60 minutes

1 minute = 60 seconds

1 hour = 60 × 60 = 3600 seconds

If 3600 seconds = 1 hour

44 seconds =

= 44/3600

= 0.0122222222 hours

Total number of hours spent = (216 + 0.05 + 0.0122222222) hours

= 216.06222222 hours

Speed = Distance/Time

= flight distance: 25,012 miles

Speed = 25,012 miles/ 216.06222222hours

= 115.76294895 miles/ hour

Approximately = 115.76 miles/ hour

b.) the fuel consumption in miles per pound of fuel

(assume a density of 0.70 g/mL for the fuel.)

Step 1

We determine how much fuel is used

We have 14 gallons of fuel left over

1 gallon = 3.785 litres

14 gallons =

Cross Multiply

14 gallons × 3.785 liters/1 gallon

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37.09706kg × 2.205 pounds

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Since the full capacity = 9000 lbs

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Hence, fuel consumption is

Distance/ amount of fuel used

25012/8918.2009827 lbs = 2.8046015164 miles/lb of fuel

Approximately = 2.8 miles/Ib of fuel

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2 years ago
Read 2 more answers
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