Answer:
8
Step-by-step explanation:
If j represents Jack's age, we have ...
2j +5 = 21
2j = 16 . . . . . . subtract 5
j = 8 . . . . . . . . divide by 2
Jack is 8 years old.
Answer:
1) C
2)C
3)B
4)A
Step-by-step explanation:
1) Circle
Solve for area
A≈28.27cm²
d=Diameter 6cm
Using the formulas
A=πr2
d=2r
Solving for A
A=1
4πd2=1
4·π·62≈28.27433cm²
2)
To calculate 5% of a number, simply divide 10% of the number by 2. For example, 5% of 230 is 23 divided by 2, or 11.5.
For the perimeter, we can literally count 8 sides, and since we have 6 inches per side, 6 added to itself 8 times or 6*8=48
Since we know that there are 12 inches in a foot, and 12 feet, we have

Feel free to ask with any further questions!
Answer:
13 / 2 is the answer in fraction and 6.5 in decimal.
hope this answer will help you