What statements are true about the parabola represented by the equation y=-7x^2+15x+28? Select all that apply

1. The parabola has a maximum

2. Since a>0, the parabola opens up

3. Since a<0, the parabola opens down

4. The parabola has a minimum

3-12. write each answer with a reasonable number of figures. find the absolute uncertainty and percent relative uncertainty for each answer. (a) [12.41 (±0.09) + 4.16 (±0.01)] x 7.068 2 (±0.000 4) =? (b) [3.26 (±0.10) x 8.47 (±0.05)] - 0.18 (±0.06) =? (c) 6.843 (±0.008) x 104 + [2.09 (±0.04)- 1.63 (±0.01)] =?

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.