Answer:
3
Step-by-step explanation:
Since y is directly related to x then the equation relating them is
y = kx ← k is the constant of variation
To find k use the condition y = 81 when x = 27
k = = = 3
Step-by-step explanation:
so we know that 3.5 is one fourth of a tank
it takes four 3.5 to make a full tank
4 * 3.5
14 gallons is your answer
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Try this option:
the rule: if f(-x)=f(x), then the function f(x) is even, if f(-x)=-f(x) then the function is odd.
1. f(x)=-5x⁴-2;
if to substitute x→(-x), then f(-x)=-5*(-x)⁴-2; ⇔ f(-x)=-5x⁴-2, in other words f(x)=f(-x), it means that this function is even.
2. f(x)=x³+2x.
if to substitute x→(-x), then f(-x)=(-x)³+2*(-x); ⇔ f(-x)=-(x³+2x), in other words f(-x)=-f(x), it means that this function is odd.