Sound, earthquakes, the brightness of stars, and chemistry, such as pH balance, a measure of acidity and alkalinity, are all instances of this.
So the shop is offering 65% off, by taking 100% - 65%, we only have to pay for 45%. In fact, 45% = 45/100 = 0.45
So here's the equation y = 0.45x
Answer:
10
Step-by-step explanation:
Given
f(x) =
x + 4 ← substitute x = 9
f(9) =
× 9 + 4
= 2 × 3 + 4
= 6 + 4
= 10