What number should be added to the expression x^2+12x to change it into a perfect square trinomial?

6

12

18

36

Is a 24, 32 and 40 a obtuse triangle?

A model of an airplane is 8 inches long. If the actual airplane is 32 feet, find the scale of the model. a. 8:1 b. 4in. = 1ft c. 1in. = 4ft d. 1:4

What is (x-4) ^2=28 when solved as a quadratic equation such as - 4+-2 square 7

A license plate is to consist of 33 digits followed by 44 uppercase letters. determine the number of different license plates possible if the first and second digits must be odd, and repetition is not permitted

A cylindrical metal pipe has a diameter of 8.4 millimeters and a height of 10 millimeters. A hole cut out of the center has a diameter of 6 millimeters. What is the volume of metal in the pipe? Use 3.

A tree with a height of 12 yards casts a shadow that is 33 yards long at a certain time of day. At the same time, another tree nearby casts a shadow that is 20 yards long. How tall is the second tree?

A paleontologist uncovers a fossil of a saber-toothed cat in California. He analyzes the fossil and concludes that the specimen contain 15% of its original carbon-14. Carbon-14 has a half-life of 5730 years.

Find the area of a circle with radius 6 cm. Use the value 3.14 for pi, and do not round your answer. Be sure to include the correct unit in your answer.

Lola rode her bike for 7/10 of an hour on Saturday and 3/5 of an hour on Sunday. How much longer did she ride her bike on Saturday than Sunday?

Write a compound inequality that represents the situation. On a road in the city of Rochester, the maximum speed is 50 miles per hour, and the minimum speed is 20 miles per hour. A. 20 ≥ x ≥ 50 B. 20 < x < 50 C. 20 > x > 50 D. 20 ≤ x ≤ 50