ElectricPavlov

Pythagorean theorem     c^2 = a^2 + b^2     c = 170

a = distance of one ship

b = distance of other ship = 70 + a

a^2  +  (70+a)^2  = 170^2

a^2  + a^2 + 140a + 4900 = 28900

2a^2 + 140a -24000 = 0                        Quadratic formula yields a =   80 miles  or    -150 (throw out)

                                                                                     other ship = 80+70 = 150 miles

Quadratic Formula     a = 2   b= -10    c = 13       yields   x = 2.5 +- .5 i            2.5 * .5 = 1.25    or  1  1/4

She needs twice as much butter as sugar    2 x 240 g = 480 g butter for 60 bis

     She'll have to buy 2 packets of butter   ....each one is 250 g    2 x 250 g = 500 g       she will have 20 g left over

60 g /15 bis   x 60 bis  = 240 g sugar needed     

                                          she needs 3x flour as sugar     3 x 240 g = 720 g flour for 60 bis

Right triangle Pythagorean theorem

d² = 6² + 8²

d² =100

d=10 miles

12 miles / 30 minutes   = .4 m/min

18 m / .4 m/min  = 45 min

sqrt(1000) = 31.6227      does that give you a clue?

3² =9

4² =16             10   11     12   13   14   15    are in between

https://web2.0calc.com/questions/help-pls_104#r3

d

a = d-6

j = 4a =   4(d-6)     summed = 108

d +       d-6       +  4(d-6)      = 108

6d          -30                         = 108 

6d                                         = 138

d =  $ 23         then a =  17        j = 68