Which experimental procedure would best determine the effectiveness of a vaccine for preventing a certain disease in pigeons?

Yo y do yall have 2 stars that means yall wrong bro

Abouncy ball is released from a certain height. on the first bounce, it travels 32cm. with each subsequent bounce, it travels 9/10 the distance of the previous bounce. what is the total distance that the ball has traveled when it completes its 25th bounce?

Which ratios are equivalent to 10: 16? check all that apply. 30 to 48 25: 35 8: 32 5 to 15