| for the third question...u see...first u have 3 x 4 ways from platt to bay. so thats 12. if you can't travel back the same way, don't you think you should subtract that road when you travel back? so when you travel back you have (3-1) x (4-1) = 6 ways. because its refering going there and coming back you must 12 x 6 = 72.
for the second question...ok assume perimeter is 10 cm...and the width is 1. so that means 10 - 2 (2 width) = 8. dive the 8 by two 9because there are two length)..you get 4..... 4: 1 = 4 times
for the 1st question
do this...3^3(15) = 3 ^y thus y = 3 x 15 = 45. |