Answer:
The solution in the attached figure
Step-by-step explanation:
we have

we know that
The solution of the inequality is the shaded area below the dashed line of the parabola
The equation of the dashed line is the vertical parabola 
therefore
The solution in the attached figure
The example of a right angle is that it's exactly 90°, the acute angle is less than 90°, and the obtuse angle is more than 90° but less than 180°.
The expression g - 7 is the answer.
Because there are 7 more girls than boys, b = g - 7.
Answer:
Prism surface area: 1,271cm
Base area: 66cm
Lateral: 1,139cm