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2 years ago

I need help with this question:

Mathematics

1 answer:

Zolol [24]2 years ago

5 0

Answer:

a) #4 vertical angles are congruent

b) # 1 ∠3 ≅ ∠7

c) # 6 Transitive property

Step-by-step explanation:

a. Vertical angles - opposite angles that are equal.

b. corresponding angles - in the same place but on different parallel lines

and are equal.

c. a = b, b = c so a = c

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mel-nik [20]

Answer:

$\boxed{\left(x+i\sqrt{\frac{2}{3}}i \right)\left(x-i\sqrt{\frac{2}{3}}i \right)}$

Step-by-step explanation:

Setting the expression equal to zero to find the roots,

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This means that

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Step-by-step explanation:

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2 years ago

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2 years ago

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Five students wrote a mathematics test. The average mark was 68. If the marks for four of the students were 75, 62, 84 and 53, t

konstantin123 [22]

Answer:

Step-by-step explanation:

Use the formula for the mean of a set of numbers:

sum of the numbers

average = --------------------------------

count of numbers

Here we know that the average mark was 68, so we can write:

75 + 62 + 84 + 53 + x

average = 68 = ----------------------------------

or 274 + x

68 = -------------------

Solving for x, we multiply both sides by 5: 340 = 274 + x.

Subtracting 274 from both sides effectively isolates x:

340 = 274 + x

- 274 -274

------------------------

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3 years ago