Answer:
10. 2 acute, 0 obtuse, 1 right
11. x = 6
Step-by-step explanation:
10. If the largest angle of a triangle is not acute, then the triangle will have 2 acute angles. Here, the largest angle is marked as a right angle, so there will be 0 obtuse angles and 1 right angle.
(If the largest angle is not acute, it will be either right or obtuse. A triangle cannot have two angles that are not acute.) The largest angle is always opposite the longest side.
11. When the triangle is isosceles, the base angles are equal. Here the apex angle is 90°, so the base angles are (180° -90°)2 = 45°. Then the equation for x becomes ...
... 7x +3 = 45
... 7x = 42 . . . . . . . subtract 3. Next, divide by 7.
... 42/7 = x = 6
