"Vary directly" is another way of saying "directly proportional".
In simple English, this just means, as one increases, the other increases too.
a = 6
b = 4
The question says find out what a is when b is 16.
First, lets find how many times larger b has gotten.
16/4 = 4
b had gotten 4 times bigger to go from b=4 to b=16
If a is varying directly, it means that it will also get 4 times bigger.
Therefore, a = 6 x 4 = 24
The correct answer would be D !m
Answer:
Hi! The answer to your question is 
Step-by-step explanation:




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Answer:
B
Step-by-step explanation:
Let the base of the triangle be <em>b</em> and the height be <em>h</em>.
The sum of the base and height is 14. Thus:

Recall that the area of a triangle is given by:

From the first equation, solve for either variable:

Substitute:

Distribute:

Distribute:

Let <em>b</em> = <em>x</em>. Hence:

Therefore, our answer is B.