What, if anything, is wrong with the following: 306 base 4

Unless you're doing something out of the ordinary, the only digits that will appear in a base-4 number are the four digits 0, 1, 2, 3. The digit 6 is unexpected.

If you assign the squiggle that looks like "6" a value of one or two, then this is a legitimate base-four number. You might find it hard to communicate with others that don't share that understanding.

5   1/4   miles per hour

step-by-step explanation:

15   3/4 / 3 = 5   1/4

option c) graph of line going through 1, 4 and 3, 10

step-by-step explanation:

let y equal to margo's coin collection

let x equal to number of years

at the begining x=0, y=1 → point=(x,y)→point=(0,1)

she adds 3 coins per year, then y=1+3x

at x=1, y=1+3(1)=1+3→y=4→point=(x,y)→point=(1,4)

at x=3, y=1+3(3)=1+9→y=10→point=(x,y)→point=(3,10)

the graph of line going through (1, 4) and (3, 10), then the option c is the correct.