3a + a - 15 = 225 . your substituting b(a-15) into the first equation. <span />
Answer: 24
Step-by-step explanation:
First count it all right 6 x 6 = 36
Then the squares inside are 4 x 3 = 12
36 - 12 = 24
I beilive that is your answer.
Answer: The second option (160 cm)
Step-by-step explanation:
1. You can obtain the perimeter of a quadrilateral by adding the lenghts of the sides.
2. You know that the ratio of the side lengths is 3:3:5:8 and the perimeter is 380 centimeters.
3. Therefore, you can write the following expression, where x is an integer:

4. Solve for x:

5. Therefore, the longest side is:
(160 cm)
31-21=15
Answer: 15m
Answer check: 36+15=51✅