Brandon bought a baseball on for $15.00. He had a coupon for a 20% discount. How much did Brandon pay for the baseball?
2 answers:
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To find the inverse
replace f(x) with y
switch all x and y
solve for y
replace y with f⁻¹(x)
f(x)=x^2-9
y=x^2-9
x=y^2-9
x+9=y^2
sqrt both sides
replace
f⁻¹(x)=
that is the inverse
replace f(x) with y
switch all x and y
solve for y
replace y with f⁻¹(x)
f(x)=x^2-9
y=x^2-9
x=y^2-9
x+9=y^2
sqrt both sides
replace
f⁻¹(x)=
that is the inverse
Answer:
Step-by-step explanation:
Let the total number of students = x,
∴ Number of boys = 40% of x = 0.4x,
So, the number of girls = students - boys
= x - 0.4x
= 0.6x
Now, 50% of the boys chosen blue as their favourite colour,
So, the number of boys whose favourite colour is blue = 50% of 0.4x
= 0.50 × 0.4x
= 0.2x,
Now, 20% of the girls chosen blue as their favourite colour,
So, the number of girls whose favourite colour is blue = 20% of 0.6x
= 0.20 × 0.6x
= 0.12x
Thus, the total students who like blue colour = 0.20x + 0.12x = 0.32x
Also, the fraction of the boys whose favourite colour is blue out of the total students who like blue