Explain how place value could be used to find the difference of 4.23 and 2.75

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)

Asix-sided die of unknown bias is rolled 20 times, and the number 3 comes up 6 times. in the next three rounds (the die is rolled 20 times in each round), the number 3 comes up 6 times, 5 times, and 7 times. the experimental probability of rolling a 3 is 10 %, which is approximately % more than its theoretical probability. (round off your answers to the nearest integer.)