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Airida [17]
3 years ago
9

What information about a triangle is necessary in order to use the cosine

Mathematics
1 answer:
Nezavi [6.7K]3 years ago
6 0
It is not 90 degrees it is 87
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The Jayden family eats at a restaurant that is having a 15% discount promotion. Their meal costs $78.96, and and they leave a 20
Karolina [17]
Multiply the cost by 1.2 (120%) to add 20% tip, and then multiply by 0.85 (85%) to take off 15%

78.96 x 1.2 x 0.85 = 80.54
7 0
3 years ago
The perimeter of the isosceles ?ABC with the base BC is equal to 40 cm. Perimeter of the equilateral ?BCD is 45 cm. Find AB and
Juliette [100K]

Answer: AB = 12.5, BC = 15

<u>Step-by-step explanation:</u>

Perimeter of ΔBCD = BC + CD + BD. Since it is an isoceles triangle, then BC = CD = BD. So, Perimeter of ΔBCD = 3BC

3BC = 45

<u>÷3   </u>    <u>÷3 </u>

 BC = 15

Perimeter of ΔABC = AB + BC + AC.  Since it is an isosceles triangle with BC as the base, then AB = AC. So, Perimeter of ΔABC = 2AB + BC

2AB + BC = 40

2AB + 15 = 40

<u>          -15</u>  <u> -15 </u>

2AB       = 25

<u>÷2         </u>   <u>÷2  </u>

      AB  = 12.5

7 0
3 years ago
Solve for x: the quantity of x plus 4 over 3 = 2.
defon

Answer:

x =2

Step-by-step explanation:

(x+4) /3 = 2

Multiply each side by 3

(x+4) /3  *3= 2*3

x+4 = 6

Subtract 4

x+4-4 = 6-4

x =2

8 0
2 years ago
Read 2 more answers
Evaluate 4 a + 5 b when a=3 and b= -1.2
Basile [38]

Answer:

6

Step-by-step explanation:

Plug the values of a and b into the equation.

4(3) + 5(-1.2)

12 + (-6)

Adding negatives basically means subtracting, so...

12-6 = 6

Therefore your answer is 6

Hope this helps!

3 0
2 years ago
Read 2 more answers
90 - 15 x 12 divided 6 Plz help! I’ll give some points!
PilotLPTM [1.2K]
I believe it’s 900. Yeah, I think the answer is 900.
3 0
3 years ago
Read 2 more answers
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