Answer:
It is an example of an observational study.
Step-by-step explanation:
Answer:
The frequency increases as the pitch increases, and the amplitude increases as the volume increases
Step-by-step explanation:
Answer:
the reciprocal of 2/7 is 7/2. you just switch the numbers
Answer:
x=3 and y=1
Step-by-step explanation:
subtract equation 2 from 1
then (2x+3y) -(2x+y) =9-7
2x-2x+3y-y =2
2y=2 therefore y=1
substitute y value in 2x+y=7
2x+1=7
2x=7-1
2x=6
x=3
Answer:
X= -12 Y=10
Step-by-step explanation: