60% of a number is 90 what is 50% of that same number

Three times the sum of a number and seven is negative thirty-six. what is the number?

D(5, 7). e(4,3), and f(8, 2) form the vertices of a triangle. what is mzdef? oa. 30° ob. 45° oc. 60° od 90°

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m