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tensa zangetsu [6.8K]
4 years ago
10

Just need help on this pre-calc math problem in WebAssign (homework), only need help with A), then I'll learn how to do the rest

Mathematics
1 answer:
bekas [8.4K]4 years ago
5 0

Step-by-step explanation:

Positive angles are measured counterclockwise from 0.  Negative angles are measured clockwise from 0.  So cos(-π/6) = √3/2.

Or, you can use angle reflection properties.

cos(-x) = cos x

cos(-π/6) = cos(π/6) = √3/2

Another way to look at it is to add 2π to the angle to turn it into a positive angle.

cos(-π/6) = cos(11π/6) = √3/2

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A tabletop in the shape of a trapezoid has an area of 7,205 square centimeters. Its longer base measures 115 centimeters, and th
sveticcg [70]

Answer:

The height is 65.5 cm

Step-by-step explanation:

h=2*\frac{A}{a+b} \\\\h=2*\frac{7205}{115+105} \\\\h=2*\frac{7205}{220} \\\\h=2*\frac{131}{4} \\\\h=65.5

8 0
3 years ago
Brandon wants to buy a new bike. The model he likes is on sale for 15% off its original price. His parents agree to pay for $50
Leno4ka [110]

Answer:

0.85x - $50

Step-by-step explanation:

Given that :

Brandon wants to buy a new bike. The model he likes is on sale for 15% off its original price. His parents agree to pay for $50 of the cost. If the original cost of the bike is x dollars, which of the expressions below represent the amount Brandon has to pay

Discount on price = 15%

Amount parents agreed to pay = $50

Cost of bike = x

Discount on bike = 0.15x

Cost after discount is removed = (x - 0.15x) = 0.85x

Parent pays $50 of cost price, amount Brandon will have to pay equals :

(0.85x - $50)

3 0
3 years ago
Han has Spent 75 minutes practicing the piano over the weekend priya practice the violin for 152% as much time as hand practicin
madam [21]

Answer: 114 minutes

Step-by-step explanation:

From the question, we are informed that Han has Spent 75 minutes practicing the piano over the weekend while Priya practice the violin for 152% as much time as Han used in practicing the piano.

Therefore, the number of minutes used in practicing by Priya would be gotten by multiplying 152% by 75 minutes. This would be:

= 152% × 75 minutes.

= 152/100 × 75minutes

= 1.52 × 75 minutes

= 114 minutes

5 0
3 years ago
Help me with my help my work I really need help I beg you. No bots plz
Kaylis [27]

Answer:

try matway

Step-by-step explanu\ation:

5 0
3 years ago
If Michelle Rollerblade around a circular track with a radius of 80 meters, how far does she skate?
Harman [31]
Michelle skated a total of 160 meters because the track is circular and to get the total measurement you have find the diameter of the circular track which is just radius times 2, leaving you with 180.
7 0
4 years ago
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