Express the quantity in standard form. Include units in your answer. - The mass of the sun is 1.98892 x 10 to the power of 15 exagrams ( work it out for brainliest )

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

Simplify 24÷(-2)(3)+7 a. -29 b. 3 c. 11

Tan198=asin164=? how to solve this? ?