Which is the least valid way to stimulate how many boys and girls are in a random sample of 20 students from a school that is half boys and half girls?
a. flip a coin 20 times, assigning one out come to boys and the other to girls
b. drop 20 coin at once and count the number of each outcome
c. count how many boys and girls are in your mat class and use a proportion
d. have a calculator generate 20 random integers and count the number of even and odd integers

On the way home from visiting his family, vincent’s plane cruised at an altitude of 3.2 × 104 feet. he had heard that a man named felix baumgartner skydived from an altitude of 1.28 × 105 feet. vincent wants to know how much higher felix went on his skydiving trip. question 1 you have already seen how adding numbers works in either scientific notation or standard notation. but can you subtract numbers in scientific notation and get the same results as subtracting in standard notation? to find out, first solve vincent’s problem in standard notation. part a write the cruising altitude of vincent’s plane in standard notation.

Solve 2x+y=3 x+y=5 in substitution method

The graph of h(x)= |x-10| +6 is shown. on which interval is this graph increasing