Will mark brainiest.
what is the expanded form of this number?
15.306
(1 × 10) +( 5 × 1) +( 3 × 1100) + ( 6× 1100)
(1 ×10 ) + ( 5 × 1) + ( 3 × 110) + ( 6 × 1100)
( 1× 10) + ( 5 × 1 ) + (3× 1100) + ( 6 × 11,000)
(1 × 10) + ( 5 × 1) + ( 3 × 110) + ( 6 ×11,000)

At the olympic games, many events have several rounds of competition. one of these events is the men's 100-meter backstroke. the upper dot plot shows the times (in seconds) of the top 8 finishers in the final round of the 2012 olympics. the lower dot plot shows the times of the same 8 swimmers, but in the semifinal round. which pieces of information can be gathered from these dot plots? (remember that lower swim times are faster.) choose all answers that apply: a: the swimmers had faster times on average in the final round. b: the times in the final round vary noticeably more than the times in the semifinal round. c: none of the above.

Factor the polynomial 4x4 – 20x2 – 3x2 + 15 by grouping. what is the resulting expression? (4x2 + 3)(x2 – 5) (4x2 – 3)(x2 – 5) (4x2 – 5)(x2 + 3) (4x2 + 5)(x2 – 3)

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?