Solve the problem.A = ?r2, where r is the radius, in centimeters. By approximately how much does the area of a circle decrease when the radius is decreased from 4 cm to 3.8 cm? (Use 3.14 for ?.)
A. 2.5 cm2
B. 5.0 cm2
C. 5.2 cm2
D. 4.8 cm2
Answer: B
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Solve the problem.Helen Weller invested $11,000 in an account that pays 11% simple interest. How much additional money must be invested in an account that pays 14% simple interest so that the total interest is equal to the interest on the two investments at the rate of 12%?
A. $8000 B. $11,000 C. $7000 D. $5500
Find the missing number.The base of a parallelogram is 32 cm and the area is 640 cm2. Find the height.
A. 19 cm B. 18 cm C. 20 cm D. 21 cm
Add and simplify. Write the answer as a mixed numeral if possible.2
+ 1
A. 3
B. 3
C. 4
D. 3
Solve the problem. Use 3.14 for ?. Round your answer to the nearest hundredth.Glenda wants to glue glitter over a piece of felt shaped like a parallelogram with a height of 32 in. and a base of 54 in. If the glitter costs $0.90 per ft2, how much will it cost to cover the felt?
A. $1555.2 B. $43.20 C. $10.80 D. $129.60