Pls help me lol (2x2 - 5)(3x2 + 4)

a
6x^4 + 7x^2 - 20
b
6^x4 + 23x^2 - 20
c
6x^4 - 7x^2 - 20
d
6x^4 - 23x^2 - 20

In parallelogram abcd the ratio of ab to bcis 5: 3. if the perimeter of abcd is 32 find ab

Explain how you can find the missing fraction in 3 4/5 / (blank) 2 5/7. then find the missing fraction.

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums, 28 play drums, 18 play the guitar. what is the probability that the applicant who gets the job plays drums or guitar?