3. a) Bishwant obtained 18.5 marks in maths, 15.7 in science and 17.9 in English (i) Find his total marks obtained. (ii) If his total marks obtained is less than total full marks by 7.9, find the total full marks.​

Grace is standing 18 feet from a lighthouse and kelly is standing 10 feet from grace. the angle that grace looks up to see the top of the lighthouse is 45°. the angle that kelly looks up to see the top of the lighthouse is y°. find the height, h, of the lighthouse. find the angle, rounded to the nearest tenth of a degree, in which kelly looks up to the top of the lighthouse. to the nearest tenth of a degree, find the value of x° . in two or more sentences, explain your calculations