If f(x) is parallel to the line y=3/4x + 2/5which function could be f(x)? f(x)=-3x+9
f(x)=-4/3x+9 f(x)=9x+2/5 f(x)=9x-5/2

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THEOUTCOMER

14.11.2020

Mathematics

126

Step-by-step explanation:

It is given that in the spring festival show, there are 5 roles left but there are 9 students interested in the roles.

We need to find the combinations of the nine students can be chosen for the five remaining roles.

It means we have to find the value of ^9C_5 .

The combination formula:

$^nC_r=\dfrac{n!}{r!(n-r)!}$

Substitute n=9 and r=5.

$^9C_5=\dfrac{9!}{5!(9-5)!}$

$^9C_5=\dfrac{9\times 8\times 7\times 6\times 5!}{5!4!}$

$^9C_5=\dfrac{9\times 8\times 7\times 6}{4\times 3\times 2\times 1}$

^9C_5=126

Therefore, the number of combinations is 126.

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If f(x) is parallel to the line y=3/4x + 2/5which function could be f(x)? f(x)=-3x+9 f(x)=-4/3x+9 f(x)=9x+2/5 f(x)=9x-5/2