Leon evaluated the expression Negative one-half(–4a – 6) + a2 for a = 8.

Negative one-half(-4(8) - 6) + 82
Negative one-half (-32-6) + 82
Negative one-half(-38) + 82
Negative one-half(-38) + 16
–19 + 16
–3
Analyze Leon's work. Check all that apply.

Use multiples to write two fractions equivalent to 7/9. 14/18, 8/10 6/8, 21/27 10/12, 28/36 14/18, 21/27

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

Sara has 2 2/3 cup taco meat. she needs 1/6 cup to make one taco. how many tacos can sara make with the taco meat she has?