Mr. y is 3 times as old as his doughter . in 15 years time . the sum of their age is 86 . a, find their age now b, how old was mr. y when his doughter born

Step-by-step explanation:

Let x represent Mr Y's current age.

Let y represent the age of his daughter.

Mr. Y is 3 times as old as his daughter. This means that

x = 3y

In 15 years time, the sum of their age is 86. This means that

(x + 15) + (y + 15) = 86

x + y + 30 = 86 - - - - - - - - - -1

Substituting x = 3y into equation 1, it becomes

3y + y + 30 = 86

4y + 30 = 86

4y = 86 - 30 = 56

y = 56/4 = 14

x = 3y = 3 × 14 = 42

Mr Y is 42 years now

His daughter is 14 years now

When his daughter was born, Mr Y was 42 - 14 = 28 years

step-by-step explanation:

let's assume

number of candles set =x

price of of x candles =p(x)

we are given

a candle maker prices one set of scented candles at $10 and sells an average of 200 sets each week

so, we get point as (200,10)

he finds that when he reduces the price by $1, he then sells 50 more candle sets each week

so, we can find slope

now, we can use point slope form of line

now, we can plug values

we can use point

and find b

now, we can plug it back

and we get

now, we can find revenue

we know that

revenue = price*quantity

so, we get