1) A train travels 25 miles in 1/5 of an hour whats the trains speed in miles per hour? 2) The height of a stack of books, h inches, is directly proportional to the number of books, n. The height of a stack of 10 books is 12 inches. A-find the constant of proportionality. B-write and equation relating to h and n. C-find the height of a stack of 24 books.
3) An 8-ounce serving of milk provides 30% of the daily value of calcium. How much milk would you have to drink to get 100% of your daily value of calcium
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Step-by-step explanation:

1.) 90 Km/h. Example: What is the speed of a cheetah that travels 112.0 meters in 4.0 seconds? ... Speed of the cheetah in miles per hour 28m 1 mile 3600 s 63 miles

2.) y=kx is the direct variation formula. Inserting the information and variables from this scenario we get h = kn.

12 = k*(10) First solve for 'k', the constant of proportionality by dividing by 10.

1.2 = k

Next write the equation using this k and the h & n.

h = 1.2*n

Now we want to find the height if we have 24 books so plug 24 in for n.

h = 1.2 * 24

h = 28.8 inches

3.) 10/3

1,150 give brainliest

step-by-step explanation

2r= 2300

r =1150

2500

step-by-step explanation: