A tree casts a shadow 28 feet long. At the same time. A 5ft tall boy casts a shadow 8ft long how tall is the tree?

The tree is 17.5 ft tall

Step-by-step explanation:

We can use ratios to solve

Shadow

height

28          8

=

tree         5

Using cross products

28*5 = 8 * tree

140 = 8 * tree

divide each side by 8

140/8 = 8 *tree/ 8

17.5 = tree

the number of the people going.

step-by-step explanation:

the cost to buy one movie ticket is $7. if the total cost for the movie is a function of how many people go, then the input is : the number of the people going.

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0