Hi, i don't know if you've done square roots before but first you start by taking the square root of the 25 on the last part of the question. Square root basically means what number can be multiplied together to get that 25. (hint: answer is 5). Then you know that the star is equal to 5 and so is the diamond. By knowing that you can solve and figure out what the triangle is. If this helped please let me know. Hope it helps.