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ELEN [110]
3 years ago
5

Can someone help me with this question please!!!!!

Mathematics
2 answers:
lianna [129]3 years ago
6 0

Answer:

a = 29

u = 12

Step-by-step explanation:

32 + 7u + 9 + 2a - 3 = 3a + 7u + 9

32 + 2a - 3 = 3a

a = 29

3(29) + 7u + 9 = 180

7u = 180 - 96

7u = 84

u = 12

Artist 52 [7]3 years ago
4 0

Solution:

<u>We know that:</u>

  • Interior angles of a triangle sum up to 180°.
  • 3a + 7u + 9 = 180\°

<u>This means that:</u>

  • (7u + 9) + (2a - 3) + 32 = 3a + 7u + 9

<em>Let's simplify the equation to find a.</em>

Step-by step calculations:

<u>Open the brackets:</u>

  • (7u + 9) + (2a - 3) + 32 = 3a + 7u + 9
  • 7u + 9 + 2a - 3 + 32 = 3a + 7u + 9

<u>Cancel same terms on both sides:</u>

  • 7u + 9 + 2a - 3 + 32 = 3a + 7u + 9
  • 2a - 3 + 32 = 3a

<u>Simplify the LHS:</u>

  • 2a + 29 = 3a

<u>Subtract 2a both sides:</u>

  • 2a - 2a + 29 = 3a - 2a
  • => 29 = 3a - 2a

<u>Simplify the RHS and change the sides:</u>

  • => \bold{a = 29}

<em>Let's substitute the value of a in 3a + 7u + 9 = 180° to find u.</em>

  • 3a + 7u + 9 = 180\°
  • => 3(29) + 7u + 9 = 180\°

<u>Simplify the LHS:</u>

  • => 87 + 9 + 7u = 180
  • => 96 + 7u = 180

<u>Subtract 96 both sides:</u>

  • => 96 - 96 + 7u = 180 - 96
  • => 7u = 84

<u>Divide 7 both sides:</u>

  • => \frac{7u}{7}  = \frac{84}{7}
  • => \bold{u = 12}

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