N figura alăturată este reprezentat un acvariu în formă de cub ABCDA C D    , AB  30cm. Pentru umplerea acvariului, care are inițial 9 litri de apă, Andrei va trebui să adauge:

As part of an annual fundraiser to raise money for diabetes research, diane joined a bikeathon. the track she biked on was 1,920 yards long. diane biked 38.5 laps. her sponsors agreed to donate an amount of money for each mile she biked. how many miles did she bike? first fill in the blanks on the left side using the ratios shown. then write your answer. given ratios: 5280ft / 1 mi , 1 mi /5280 ft , 1,920 yards / 1 lap , 1 lap / 1,920 yards , 3 ft / 1 yard , 1 yard / 3 ft. blanks: 38.5 laps / 1 yard x (blank) x (blank) x (blank) = (blank) miles i'm really confused on how to do this, and the explanations aren't exactly . if you could walk me through how to do this, it would be greatly appreciated.

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels