| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.81 |
| Score | 0% | 56% |
The total water usage for a city is 35,000 gallons each day. Of that total, 11% is for personal use and 42% is for industrial use. How many more gallons of water each day is consumed for industrial use over personal use?
| 11,550 | |
| 10,850 | |
| 1,550 | |
| 11,000 |
42% of the water consumption is industrial use and 11% is personal use so (42% - 11%) = 31% more water is used for industrial purposes. 35,000 gallons are consumed daily so industry consumes \( \frac{31}{100} \) x 35,000 gallons = 10,850 gallons.
A triathlon course includes a 200m swim, a 30.3km bike ride, and a 10.100000000000001km run. What is the total length of the race course?
| 39.1km | |
| 40.6km | |
| 66.1km | |
| 26.5km |
To add these distances, they must share the same unit so first you need to first convert the swim distance from meters (m) to kilometers (km) before adding it to the bike and run distances which are already in km. To convert 200 meters to kilometers, divide the distance by 1000 to get 0.2km then add the remaining distances:
total distance = swim + bike + run
total distance = 0.2km + 30.3km + 10.100000000000001km
total distance = 40.6km
Which of the following statements about exponents is false?
b0 = 1 |
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all of these are false |
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b1 = 1 |
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b1 = b |
A number with an exponent (be) consists of a base (b) raised to a power (e). The exponent indicates the number of times that the base is multiplied by itself. A base with an exponent of 1 equals the base (b1 = b) and a base with an exponent of 0 equals 1 ( (b0 = 1).
a(b + c) = ab + ac defines which of the following?
distributive property for multiplication |
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commutative property for multiplication |
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distributive property for division |
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commutative property for division |
The distributive property for multiplication helps in solving expressions like a(b + c). It specifies that the result of multiplying one number by the sum or difference of two numbers can be obtained by multiplying each number individually and then totaling the results: a(b + c) = ab + ac. For example, 4(10-5) = (4 x 10) - (4 x 5) = 40 - 20 = 20.
What is \( 9 \)\( \sqrt{112} \) + \( 9 \)\( \sqrt{7} \)
| 81\( \sqrt{112} \) | |
| 81\( \sqrt{16} \) | |
| 45\( \sqrt{7} \) | |
| 81\( \sqrt{784} \) |
To add these radicals together their radicands must be the same:
9\( \sqrt{112} \) + 9\( \sqrt{7} \)
9\( \sqrt{16 \times 7} \) + 9\( \sqrt{7} \)
9\( \sqrt{4^2 \times 7} \) + 9\( \sqrt{7} \)
(9)(4)\( \sqrt{7} \) + 9\( \sqrt{7} \)
36\( \sqrt{7} \) + 9\( \sqrt{7} \)
Now that the radicands are identical, you can add them together:
36\( \sqrt{7} \) + 9\( \sqrt{7} \)