Solve.The area code for a phone number in a city can be either 813 or 218. The rest of the 7-digit phone number can be formed with the digits 0 through 9. How many phone numbers can the city have before it needs to have another area code?
A. 18,000
B. 1,000,000
C. 130,000
D. 20,000,000
Answer: D
Mathematics
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Using the Superposition Theorem, find IR3 and VR4 .
E1 = 15.0 V
E2 = 35.0 V
R1 = 10 Kê
R2 = 10 Kê
R3 = 25 Kê
R4 = 15 Kê
Mathematics
Use < or > for ? to write a true sentence. Draw a number line if necessary.31 ? 38
A. < B. >
Mathematics
Solve the problem.The perimeter of a rectangle is 52 m. If the width were doubled and the length were increased by 23 m, the perimeter would be 108 m. What are the length and width of the rectangle?
A. Length: 13 m; width: 8 m B. Length: 21 m; width: 5 m C. Length: 13 m; width: 13 m D. Length: 5 m; width: 21 m
Mathematics
Solve.On a map, 1 in. represents 120 miles. How much does 
in. represent?
A. 72 mi B. 62 mi C. 200 mi D. 82 mi
Mathematics