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malfutka [58]
2 years ago
10

A student is told to work any 8 out of 10 questions on an exam. In how many different ways can he complete the exam

Mathematics
1 answer:
Korolek [52]2 years ago
7 0

Answer:

Step-by-step explanation:

Assuming the order in which he answers the questions matter the answer is the number of permutations of 8 in 10.

This is 10! / (10-8)!

= 1,814.400.

If the order does not matter then the answer is the number of combinations of 8 from 10:

This is 10!/8!*2!

= 45.

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mel-nik [20]

Answer:

40 students

Step-by-step explanation:

In this problem, one is given the ratio ( 8 : 3 ), since a ratio is another way of writing a fraction one can rewrite it as; \frac{8}{3} (8) represent the number of students who want to learn about magnets, and (3) represents the number of students who want to learn about magic tricks.

In the problem, it is also given that 25 more students wanted to learn about magnets compared to magic tricks. If one uses the parameter (x) to represent the factor by which the fraction \frac{8}{3} is reduced, then one can get the equation;

8x = 3x + 25

Use inverse operations to solve,

8x = 3x + 25

-3x

5x = 25

/5

x = 5

Substitute back in to find out how many students want to learn about magnets,

8x

= 8(5)

= 40

3 0
2 years ago
What is the distributive property of 15+21
Marysya12 [62]

Answer:105 thats with reducing to  

Step-by-step explanation: 15(21/3)

                            then 15/1 x 21/3 then simplify

                                 15 x 21 over 1 x 3 then simplify 315/3 then reduce then get 105 is your anwser

                                                 

5 0
3 years ago
Read 2 more answers
6 Which equation has a solution of s = 9.5 ? F -5s = -47.5 G -3 + s = 12.5 H --2s 19 J –1 + s = 10.5​
earnstyle [38]

Answer:

F. -5s = -47.5

Step-by-step explanation:

F. -5s = -47.5

s = -47.5 / -5

s =  9.5

This is the correct option

G. -3 + s = 12.5

s = 12.5 + 3

s = 15.5 (Incorrect option)

J. –1 + s = 10.5​

s = 10.5 + 1

s = 11.5 (Incorrect option)

5 0
3 years ago
Simplify −(3p53q3)−5.
arsen [322]

Answer: -3p^53q^3-5

Step-by-step explanation:

7 0
2 years ago
In this set of data, at what percentile is 10? At what percentile is 18? 10, 10, 10, 12, 14, 16, 16, 18, 18, 18​
zhenek [66]

Answer:

Step-by-step explanation:

8

8 0
3 years ago
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