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3 years ago

A university lecture hall has 100 seats. During class, 30% of the seats are empty. How many students are attending class?

Mathematics

2 answers:

Alika [10]3 years ago

7 0

Answer:

70 students

Step-by-step explanation:

100=100% so -30 to get 70 students

Shtirlitz [24]3 years ago

3 0

Answer:

70 students are attending class

Step-by-step explanation:

100% - 30% = 70%

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3 years ago

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Solve 7x – 2y = –3 <br> 14x + y = 14 a. (4,5/7) b. (4,7/5) <br> c. (5/7,4) d. (7/5,4)

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7x - 2y = -3 . . . (1)
14x + y = 14 . . . (2)
(1) x 2 => 14x - 4y = -6 . . . (3)
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4 years ago

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Simplify 1/4-7i to get a complex number in standard a + bi form.

Romashka [77]

Answer:

$\frac{1}{4-7i}=\frac{4}{65}+\frac{7}{65}i$

Step-by-step explanation:

we are given

$\frac{1}{4-7i}$

Firstly, we will get rid of imaginary term from denominator

so, we will multiply conjugate to both top and bottom term

$\frac{1}{4-7i}=\frac{1\times (4+7i)}{(4-7i)\times (4+7i)}$

$\frac{1}{4-7i}=\frac{4+7i}{4^2-(7i)^2}$

$\frac{1}{4-7i}=\frac{4+7i}{16+49}$

$\frac{1}{4-7i}=\frac{4+7i}{65}$

we can also write as

so, we get

$\frac{1}{4-7i}=\frac{4}{65}+\frac{7}{65}i$

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3 years ago