Answer:
D - Area = 9/16pi cm²
Step-by-step explanation:
in order to evaluate this question , we will first of all find the radius using the formula for finding the circumference of a circle , we will then find the area of a circle.
<u>solution</u>
given that circumference of a circle = 3/2picm
recall that the formula for finding the circumference of a circle = 2πr
3/2picm = 2πr
multiply through by 2
3picm = 4pir
divide both side by 4pi
3pi cm/4pi = r
r = 3/4 picm
Recall that the Area of a circle = πr²
Area = pi ( 3/4)² cm
Area = 9/16pi cm²
by two linear equation system the investment in Bonds: $31,500
CD: $25,500 .
Total invested = Amount in bonds + Amount in CDs
Amount in bonds = Amount in CDs + 6000
Let the amount in bonds = B and the amount in CDs = C
1. 57,000 = B + C
2. B = C+6000
these are two linear equation system
57,000 = C + 6000 + C
57,000 = 2C + 6000
51,000 = 2C
25,500 = C
B = C+6000
B= 25,500+6000 = 31,500
Bonds: $31,500
Certificates of deposit: $25,500
learn more about two linear equation system here:
brainly.com/question/1551388
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Answer:
1. Experiment
2. Observation study
3. Experiment
4. Observation study
5. Experiment
Step-by-step explanation:
Observational study Vs. Experiment
- An observational study is a study where researchers simply collect data based on what is observed and give results based on the data collected.
- There is no control over the variables in an observational study.
- An experiment is a method of applying treatments to a group and recording the effects.
- The variables in a an experiment can be controlled.
- An observational study is where nothing changes but in an experimental study we have control over groups and may change.
1. This is an experiment as people were divided into groups and treatment were given.
2. This is an observational study as no treatment was done on the people just political preference was measured on the basis of collected data.
3. This is an experiment as farmers were divided into groups and effects of a new pesticide was tested.
4. This is an observational study as the data collected told about effect of exercise on lowering the risk of cancer and no experiments were carried out.
5. This is an experiment as people were divided into groups and cholesterol was measured with and without exercise.
Answer: 10-5=5
Simple math :D
Step-by-step explanation:
