Aschool has 300 eighth-grade students and 200 ninth-grade students. the secretary randomly selects 12 eighth-grade students and 8 ninth-grade students to obtain a sample of size 20. what kind of sampling is this?

simple random sampling
stratified random sampling
systematic sampling
convenience sampling

What is the value of the digit 1 in the number 13?

Asap the total attendance for all of a baseball league in 2012 was about 7.5×107 fans, while the attendance for the tornadoes in 2012 was about 1.5×106 fans. about how many times more was the attendance for the entire baseball league than the attendance for just the tornadoes? 50 times more 10 times more 2 times more 5 times more

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1