10x + 6 by simple developping
First use pythagoras thereom to find AD ; 10^2 -8^2, square rooted. Then find DC , again using pythagoras thereom, 17^2-8^2, square rooted. Now you have AD and DC, use pythagoras thereom ; AD^2 + DC^2 = AC^2
Okay so instead of in place value going 1,10,100 in binary you go 1,2,4 so it would go 256:1,128:0,64:0,32:1,16:1,8:0,4:0,2:0,1:1=1+16+32+256=305. So 100110001=305 in binary. It is also would take 1+1/2 bytes or 9 bits to store the number. Hope this helps.
FOIL method
First:
u squared times u squared equals to u to the fourth.
Outer and Inner:
8u squared + u squared equal 9u squared. Remember, the exponents don't change when adding!
Last:
8 times 1 equals 8
Rate for 1 mile is 1.75$+0.75$=2.50$
Jack has 10 $ to spend
when 2.50$ for 1 mile
so 10 $ for 10/2.50=4 mile he can travel