Answer:
20
Step-by-step explanation:
Given function f(x)=
We need to find f(-4) which means we need to find the value of the function when x=-4 .
On substituting x=-4 in the given function:
f(-4)=
Square of -4 is 16.
Hence, f(-4)=
=
Hence the value of the given function f(x)= when x=-4 is 20.
Answer:
120 pounds
Step-by-step explanation:
Since the new cost is 144 pounds and this is 20% more, this is 120% of the original price. Remember 100+20 = 120. To find the original price set up a proportion with these values:
Solve for the original price by cross multiplying numerator with denominator.
x(120) = 144(100)
120x = 14400
x= 120 pounds
