Thrity times the square of a non-zero number is equal to 8 times the number. what is the number. pls so confused

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

Eliza wants to make $10,000 from her investments. she finds an investment account that earns 4.5% interest. she decides to deposit $2,500 into an account. how much money will be in her account after 14 years?

Find the missing dimension! need asap! tiny square is a =3025 in ²