How to tell when to use positive or negative symbols when dividing?

15. The vertices of A DEF are D (0,0), E (0,7), and F (6,3). Find the coordinates of the orthocenter of A DEF.

Fiona starts at the beginning of a hiking trail and walks 4/5 mile. She counts the mileage markers that are placed every 1/10 mile along the trail. How many markers does she count?

The angle A is such that secA + tanA = 2 Show that secA-tanA=1/2 Hence, find the exact value of cosA.

Jim wants to start investing in bonds. He checks with two brokers to ask them for suggestions of bonds to buy. Broker J, who charges a commission of 3.

Evaluate 3ab for a = 2 and b = 3. 6 9 18

The cross section of a metal ingot is is a trapezoid the cross-section of an area of 39 square centimeters the top base of a cross section is 12 CM the length of the bottom base is 2 cm greater than the top base how tall is the Metal Ingot. explain

17=14 3/4 + 1/6 + missing number

The world record for the women's 3,000-m steeplechase is 9 min 1.59 s. Find the runner's speed in meters per second. Round answer to the nearest hundredths.

A rectangle has an area of 85 square cm. If the length is 2 more than 3 times its width, find the dimensions of the rectangle

If arrivals occur at a mean rate of 3.6 events per hour, the exponential probability of waiting more than 0.5 hour for the next arrival is: