Answer:
the last one
Step-by-step explanation:
plug in -2 for x and -3 for y
Answer:
Step-by-step explanation:
1 = quadratic
2 = quadratic
3 = linear
4. quadratic
hope it is correct :D
Answer:
68
Step-by-step explanation:
just put the value of a and b in the expression and you will get the answer
20/a+7.b is
20/4+7×9
5+63
68
Answer: 0.87 times per second (Or 52.2 times per minute)
Step-by-step explanation:
You need to make the conversion from minutes to seconds.
Remember that 1 minute has 60 seconds. Then 20 minutes to seconds is:

Find the number of times the heart beats in 1 second when it is rowing:

Find the number of times the heart beats in 1 second when it is resting:

Then the difference is:

(Or 52.2 times per minute)
Divide the circumference by pi, then divide that by 2, then you would have the radius, and the area is r squared multiplied by pi