Mr. lin is four times as old as his daughter. in 4 years he will be three times as old as his daughter. how she is his daughter now?

The present age of Mr. Lin's daughter  = 8 years old.

The present age of Mr. Lin =   32 years old

Step-by-step explanation:

Let the present age of Mr. Lin's daughter  = x yrs old

So, the present age of Mr. Lin = 4 times  daughter's age  = (4 x) yrs

Now, age of daughter after 4 years   = (x + 4) yrs

and the age of Mr. Lin after 4 years=  ( 4x + 4) years

Also, ( 4x + 4)  =  3 times (x+4)

According to the  question:

4x + 4 = 3(x+4)

or, 4x + 4 = 3x + 12

⇒ 4x - 3x =  12 -4

or, x = 8

Hence, the present age of Mr. Lin's daughter  = 8 years old.

and the present age of Mr. Lin = 4 x =  4 x 8 =  32 years old

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50

answer: the answer is 30 miles per hour.

ft/s -> mphmph = ft/s 1.466667mph = 44 divided by 1.466667mph = 30.00000

- r3ktforgood ☕