Hi there!
The word "of" is the same thing as a multiplication sign.
1) 
20% = 0.2
0.2 × 20 = 4
2) 
? × 30 = 15
divide each side of the equation by 30
? = 0.5
0.5 = 50%
3)
50% = 0.5
0.5 × ? = 50
divide each side of the equation by 0.5
? = 100
There you go! I really hope this helped, if there's anything just let me know! :) 
 
        
                    
             
        
        
        
The function that Ngozi's salary s(t) in dollars, t years after she starts to work as an interpreter is given by  .
.
 
What is a function?
- A function in mathematics from a set X(ax) to a set Y allocates exactly one element of Y to each element of X(ax). 
- A relation between a collection of inputs and labor is known as a function. 
You can use the fact that the raise is done on the previous year's salary.
Let the initial salary be P = $24000
After 1 year, her salary increased by R = 3.5% which, thus,
Total salary = P + increment 
Similarly going on, we get
 (we can say)
 (we can say)
Putting values of P(value of P) and R(value of R), we get

Thus,
The function that Ngozi's salary s(t) in dollars, t years after she starts to work as an interpreter is given by

Learn more about function here:
 brainly.com/question/25638609
#SPJ4
 
        
             
        
        
        
(y+2) (x+5) this your answer
        
             
        
        
        
10,171.07 pesos
To every US dollar, it equal 18.84 pesos.
 
        
             
        
        
        
PART A:
Scientific notation is given by A×10ⁿ where A is any number in a unit and 'n' is an integer.
0.000025 = 2.5×10⁻⁵
PART B:
Diameter of grain of sand ÷ Diameter of human body average cell
(2×10⁻⁴) ÷ (1×10⁻⁵) 
(2÷1) × (10⁻⁴÷10⁻⁵)
2 × (10⁻⁴ ⁻ ⁻⁵) = 2 × 10⁽⁻⁴⁺⁵⁾ = 2 × 10¹ = 20 times bigger
PART C:
The diameter of human body's average cell in nanometer
1 × 10⁻⁵ metre = 1 × 10⁻⁵ × 10⁹ = 1 × 10⁽⁻⁵⁺⁹⁾ = 1 × 10⁴ nanometer
PART D:
Smallest bacteria = 300 nanometer
300 nm = 300 ÷ 10⁹ = (3 × 10²) ÷ 10⁹ = 3 × (10²⁻⁹) = 3 × 10⁻⁷ meter
PART E:
Laws of exponents that are applied in scientific notation is 
xᵇ × xᵃ = x⁽ᵇ⁺ᵃ⁾
xᵇ ÷ xᵃ = x⁽ᵇ⁻ᵃ⁾