Please answer these questions so I will learn this material

QUESTION 18 0.5 In order to estimate the width of a river, similar triangles can be used as shown in the diagram. Three markers, O, C, and E are placed on the upper bank of the river forming a right triangle. E is on the bank of the river and OC is perpendicular to CE. A marker N is placed across the river and collinear with C and E. Another marker, A is placed downstream on the bank so that CN is perpendicular to NA. If OC is 87 feet, CE is 58 feet, and NA is 129 feet, find the estimated width of the river, NE, in feet. N AQUESTION 20 0.5 points At a certain time in the afternoon a light pole casts a shadow that is 11 ft 9 in long. At the same time, a woman of height 4 ft 6 in casts a shadow that is 18 inches long. How tall is the light pole? Give your answer in inches