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2 years ago

There are 90 seats on a train. 63 of the seats are empty. What percentage of the seats on the train are empty?

Mathematics

1 answer:

Trava [24]2 years ago

8 0

Answer:

70%

Step-by-step explanation:

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Ellen is drawing two polygons. One of the polygons has three more angles than the other. What shapes could she be drawing?

Sauron [17]

I believe the answer is they are drawing an Octagon because a polygon has 5 sides add that by three it's an Octagon

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2 years ago

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A scale on a map shows that 2 inches = 25 miles. how many inches on the map represent 60 miles

kipiarov [429]

60 miles is equivalent to 2.4 inches.

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3 years ago

Consider the isosceles triangle below where the side lengths are given in cm:

DiKsa [7]

Answer:

I think is B

because its the one that sounds good

7 0

2 years ago

<img src="https://tex.z-dn.net/?f=%5Cfrac%7B%5Csec%5Cleft%28x%5Cright%29%7D%7B%5Ccos%5Cleft%28x%5Cright%29%7D-%5Cfrac%7B%5Csin%5

DanielleElmas [232]

Answer:

Step-by-step explanation:

First, convert all the secants and cosecants to cosine and sine, respectively. Recall that $csc(x)=1/sin(x)$ and $sec(x)=1/cos(x)$ .

Thus:

$\frac{sec(x)}{cos(x)} -\frac{sin(x)}{csc(x)cos^2(x)}$

$=\frac{\frac{1}{cos(x)} }{cos(x)} -\frac{sin(x)}{\frac{1}{sin(x)}cos^2(x) }$

Let's do the first part first: (Recall how to divide fractions)

$\frac{\frac{1}{cos(x)} }{cos(x)}=\frac{1}{cos(x)} \cdot \frac{1}{cos(x)}=\frac{1}{cos^2(x)}$

For the second term:

$\frac{sin(x)}{\frac{cos^2(x)}{sin(x)} } =\frac{sin(x)}{1} \cdot\frac{sin(x)}{cos^2(x)}=\frac{sin^2(x)}{cos^2(x)}$

So, all together: (same denominator; combine terms)

$\frac{1}{cos^2(x)}-\frac{sin^2(x)}{cos^2(x)}=\frac{1-sin^2(x)}{cos^2(x)}$

Note the numerator; it can be derived from the Pythagorean Identity:

$sin^2(x)+cos^2(x)=1; cos^2(x)=1-sin^2(x)$

Thus, we can substitute the numerator:

$\frac{1-sin^2(x)}{cos^2(x)}=\frac{cos^2(x)}{cos^2(x)}=1$

Everything simplifies to 1.

7 0

2 years ago

See how temperature is San The high temperature in San Juan is 123° and the low temperature is -13°. What is the difference in t

storchak [24]

Answer:

110

Step-by-step explanation:

123 + -13 = 110

I tried.

hope that helps

4 0

2 years ago