From the given information, a exists jointly proportional to b and c.
then 
Therefore, the value of a exists 2.
<h3>
What is the value of a?</h3>
Given, a exists jointly proportional to b and c.

Taking K as the constant of proportionality.
a = K b c
For b = 8 and c = 9, the value of a = 4
4 = K(8)(9)
4 = 72 K
Dividing the equation by 72, we get

Using the value of K in the equation:

Substitute the values of b = 2 and c = 18, in the above equation

a = 2
Therefore, the value of a exists 2.
To learn more the value of x refers to:
brainly.com/question/11874663
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Answer:
amar mata
Step-by-step explanation:
:)
Answer:
(-1,-1)
Step-by-step explanation:
4-6 3-5
------- , ---------
2 2
(-2/2,-2/2)=(-1,-1)
Answer:
4- -1=3
Step-by-step explanation:
7. m=3 (4,-1)
do the () inside first so
4- -1 = 3
hope this helps for number 7