ElectricPavlov

d / 3      =   d/5   + 2/3      solve for  d       ( 2/3  is 40 minutes )

d  = 3/5 d + 2

2/5 d = 2

d = 5  miles

Multiply first equation by 3 and re-arrange   to  x = 3-6y     Substittute this value of x into the second equation

y = 2/3 ( 3-6y) - 4      solve this equation for y    then use this value of y in one of the equations to find x

G =   s*52 / 365                grandson age in years

A =   s*52/365   * 12         adult's age  (what the question is asking )

s = son's age                    summed = 120

s*52/365   +  s   +  s*52/365  * 12  =  120

solve for s = 42 y/o

then  G = 6 y/o

A = 42*52/365  * 12 =  ~72 y/o

https://web2.0calc.com/questions/a-family-affair

https://web2.0calc.com/questions/tough-but-fun-hard-maths-question

Not A       if x = 1   you wil be dividing by 0     not allowed

Not B        imaginary numbers will happen

C

Not D        imaginary numbers again

y = mx + b        b is the y-axis intercept when x = 0      b = -5

find the slope   (y1-y2) /(x1-x2)     =     5/2

y = 5/2 x -5

Put both lines into   y = mx + b form     m is the slope....for the lines to be || the slope must be the same

y = (3a+2)x - 2

y = 1/2(a-4) x +1              so    3a+ 2   =  1/2 (a-4)     I'll let you finish......

Area = base x height for a parallelogram    base = 14

find height     sin 45 = h/10      solve for h    then   area  =   14 * h

(4x+3)(x-8)+(x-5)(4x+3)=0

4x^2 - 32x  + 3x - 24     +     4x^2+3x-20x-15

8x^2 -46x-39 = 0    Quadratic formula shows x = 6.5   and   - .75

Hmmmm....   I do not have any of the numbers ending or starting with zero..... Only the middle number can be zero in my answer....

   I still find 60 numbers.....   can you explain further?

Wait a minute.....I found my error ....I edited my answer above.....I mistakenly listed 4 as a possible, when I should have only counted down to 5   ...just a math error in my post....  THANX !

9 n 5    -   5 n 9

8 n 4  -  4 n 8

7 n  3 -  3 n 7

6  n 2 -  2 n 6

5 n 1   - 1 n 5        'n, can be any  0-9       so  5 x 10 = 50