At the city museum, child admission is S5.20 and adult admission is $9.50. On Friday, 167 tickets were sold for a total sales of $1255.40. How many adult tickets were sold that day?

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .