Toilet  used  gallons of water in the last hour and uses  gallon of water per flush.  If Toilet  was flushed the same amount, but uses  gallons per flush, how much water did Toilet  use?

The length of an arc, , of a circle is  and the radius, , of the circle is . What is the measure in degrees of the central angle, , formed by the arc ?

Below is a table of earnings from playing blackjack.

Find the rate at which this is depreciating at each month.

Below is a table of earnings from playing blackjack.

Find the equation of depreciation. 

What is the average number of apples a student has?

Find the Ratio of Solution 1 to Solution 2 in the following quadratic equation, where Solution 1 is   and  is a constant.

Without earthworms, modern land-based ecosystems would look very different. There 1 are no way to predict the exact changes that would exist without earthworms, but it is easy to recognize earthworms’ impact. As research continues into the effect of earthworms, scientists are confident that it will show an even more complex picture of the earthworm’s contribution to the land-based ecosystem.

The Sagrada Familia has stood, incomplete, as part of the Barcelona skyline since the early phases of its construction in 1882. The project, originally intended to be a cathedral in the gothic style, was begun by the bookseller Joseph Maria Bocabella under the direction of the architect Francisco de Paula del Villar. Del Villar and Bocabella imagined a basilica modeled on the Gothic revival churches Bocabella had seen on trips to Italy. However, Bocabella’s ideal basilica never came to be. In 1883 del Villar resigned from the project, and 30-year old Antoni Gaudi, a young but already well known architect from Catalonia, took over as lead architect.

Gaudi 1 decided that departing from del Villar’s original Gothic design in favor of a more modern design. The new design was ambitious, featuring eighteen tall spires and four different facades on different sides of the basilica. But work on the new building was slow. Decades passed, and the work was still incomplete. In 1915, Gaudi - now 63 years old - abandoned all other work in favor of dedicating himself to the completion of the monumental church, but progress on the building was still slow. When pressured to speed up work on the monumental building, Gaudi was said to have replied, “My client is not in a hurry.”  By the time Gaudi died in 1926, the basilica was only somewhere between 15 and 20 percent complete.

Invertebrates are animals without vertebrae. Arthropods, including arachnids that has eight legs, are in this phylum. Some species in this phylum include scorpions, spiders, and ticks. There are over 45,000 known species of spiders; however, scientists estimate that the same number are still undiscovered.

Music has been around for all of human history, and many cultures have their own styles and instruments. Recently, researchers have identified what are believed to be the oldest musical instruments in the world. Scientists has used carbon dating to discover that flutes made from bird bone and mammoth ivory found in southern Germany were between 42,000 and 43,000 years old.