in rectangles ABCD, AC=3x+15 and DB==4x-5.
Find the length of AC

Answer: 75
Step-by-step explanation:
Since AC and BD are diagonals of a rectangle, they must be congruent.
Therefore, 3x + 15 = 4x - 5.
We can combine like terms:
x = 20
Therefore, AC = 3*20 + 15
= 60 + 15
= 75
Answer:
For, rectangles ABCD.
AC=BD
3x+15=4x-5
4x-3x=15-5
x=20
AC=3x+15
= 3(20)+15
= 60+15
= 75