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4 years ago

Can someone please help me with this question :)

Mathematics

1 answer:

Ugo [173]4 years ago

6 0

Answer:

Step-by-step explanation:

Sin80° = opp/hyp

Sin80° = 21/y

ysin80° = 21

y = 21/sin80°

y = 21.3

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There are 40 pupils in a class. 75% of them are present. How may are present? How many are absent?

Aleonysh [2.5K]

Answer:

30 are present 10 are absent

Step-by-step explanation:

75%=3/4

so 3/4 of them are absent

3/4(40)=30

and 40-30=10 are absent

8 0

2 years ago

Ashley is packing her bags for her vacation. She has 8 unique Fabergé eggs, but only 5 fit in her bag. How many different groups

irakobra [83]

Answer:

56 groups of 5 Fabergé eggs can be taken.

Step-by-step explanation:

It is given that Ashley is packing her bags for her vacation. She has 8 unique Fabergé eggs, but only 5 fit in her bag. In order to find how many different groups of 5 Faberge' eggs can she take, we apply the combination formula:

$8C_{5}=\frac{8!}{5!(8-5)!}$

$8C_{5}=\frac{8!}{5!3!}$

$8C_{5}=\frac{8{\times}7{\times}6{\times}5!}{5!{\times}3{\times}2}$

$8C_{5}=56$

Thus, 56 groups of 5 Fabergé eggs can be taken.

8 0

4 years ago

a triangle has a 40° angle, a 120° angle and a side 2.5 centimeters in length. which of the following statements are true about

pochemuha

Answer:

Step-by-step explanation:

A triangle is 180 degrees so 120+40 is 160

180-160=20

6 0

3 years ago

How do u do question #15

Tom [10]

It is basically saying that you need to write 3 1/2 as ounces and pounds but in whole numbers. The answer is 3 pounds and 8 ounces.

7 0

3 years ago

Read 2 more answers

In the diagram above

Reil [10]

Answer:

Step-by-step explanation:

We have parallel lines.

Angles 1 and 2 are alternate angles.

With parallel lines, alternate angles are congruent.

Therefore

$m\angle1=m\angle2$

$m\angle1=2x+20,\ m\angle2=3x+10\\\\2x+20=3x+10\qquad\text{subtract 20 from both sides}\\\\2x+20-20=3x+10-20\\\\2x=3x-10\qquad\text{subtract}\ 3x\ \text{from both sides}\\\\2x-3x=3x-3x-10\\\\-x=-10\qquad\text{change the signs}\\\\x=10\\\\m\angle1=2(10)+20=20+20=40$

4 0

3 years ago