Study circle C, where diameter AB¯¯¯¯¯¯¯¯ is perpendicular to chord MN¯¯¯¯¯¯¯¯¯¯ at point O. The diagram as described in the text.

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If MO=5x−7 and NO=18, what is the value of x?
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The perimeter of △cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.

7x^2-9x+5=0 find the discriminant and number of real solutions

My garden is 20 feet by 35 feet. i want to spread mulch 3 inches deep. bags of mulch are 0.33 cubic yards each and cost $10. how much will this project cost me? (show all work)