请帮我解答题目---Here is the extraction of the content from the image: **Problem Number:** 18. **Given Information:** 已知A(0, a)、B(b, 0), 且 $\sqrt{a-5} + (b-4)^2 = 0$. (Given A(0, a), B(b, 0), and $\sqrt{a-5} + (b-4)^2 = 0$.) **Mathematical Equation:** $\sqrt{a-5} + (b-4)^2 = 0$ **Diagrams:** * **图1 (Figure 1):** * Type: Coordinate system with points and lines. * Elements: X-axis, Y-axis, Origin O. * Points: A on the positive Y-axis, B on the positive X-axis, C on the negative X-axis, E on the negative Y-axis. * Lines: Line segment AB, line passing through C and E, intersecting the Y-axis at E and the X-axis at C. Line segment OA, OB. Triangle ABC is formed by points A, B, and C. * Labels: x, y, O, A, B, C, E. * Title: 图1 (Figure 1) * **图2 (Figure 2):** * Type: Coordinate system with points and a line segment. * Elements: X-axis, Y-axis, Origin O. * Points: A on the positive Y-axis, C on the negative X-axis. * Line Segment: AC. Triangle formed by A, C, and an implied point F (mentioned in question 2 ②). * Labels: x, y, O, A, C. * Title: 图2 (Figure 2) **Questions:** (1) 直接写出点A、B的坐标; (Directly write out the coordinates of points A and B;) (2) 点C为x轴负半轴上一点满足$S_{\triangle ABC}=15$. (Point C is a point on the negative half-axis of the x-axis satisfying the area of triangle ABC is 15.) ① 如图1, 平移直线AB经过点C, 交y轴于点E, 求点E的坐标; (As shown in Figure 1, translate the line AB through point C, intersecting the y-axis at point E, find the coordinates of point E;) ② 如图2, 若点F(m, 10)满足$S_{\triangle ACF}=10$, 求m. (As shown in Figure 2, if point F(m, 10) satisfies the area of triangle ACF is 10, find m.)