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balandron [24]
2 years ago
12

HOW TO DO THIS QUESTION ​

Mathematics
2 answers:
nata0808 [166]2 years ago
7 0

9514 1404 393

Answer:

  64.2 cm²

Step-by-step explanation:

The length AC is found from ...

  Area of ACD = (1/2)(AC)(CD)

  80.5 cm² = (1/2)(AC)(14 cm)

  AC = 80.5 cm²/(7 cm) ≈ 11.5 cm

__

The area of ∆ABC is ...

  Area ABC = (1/2)(CB)(CA)sin(C)

  = (1/2)(19 cm)(11.5 cm)sin(36°) ≈ 64.2 cm²

sdas [7]2 years ago
3 0

Answer:

A ≈ 40.3 cm²

Step-by-step explanation:

The area of right Δ ACD is calculated as

A = \frac{1}{2} bh ( b is the base and h the perpendicular height )

Here A = 50.5, b = CD and h = AC , then

\frac{1}{2} × 14 × AC = 50.5

7 AC = 50.5 ( divide both sides by 7 )

AC ≈ 7.214

The area of Δ ABC is calculated as

A = \frac{1}{2} × BC × AC × sin36°

  = 0.5 × 19 × 7.214 × sin36°

  ≈ 40.3 cm² ( to 3 sf )

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Roy and Elisa are buying tickets for the annual school concert. Roy buys 6 adult tickets and 2 child tickets for a total of $66.
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Answer:

<em>The system of equations is.....</em>

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Step-by-step explanation:

The cost of one adult ticket is 'a'  and the cost of one child ticket is  'c'

Roy buys 6 adult tickets and 2 child tickets for a total of $66.

So, the cost of 6 adult tickets =6a dollar and the cost of 2 child tickets =2c dollar.

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