The language of science is (a) mathematics. (b) Latin. (c) Chinese. (d) Arabic.

What exactly is a projectile ?

Why do projectiles have curved paths?

Enter the molecular formula for butane, C$_4$H$_{10}$. express your answer as a chemical formula.

Calculate the angular speed (in $\mathrm{rad} / \mathrm{s}$ ) of the given hands on a clock. (a) Second hand (b) Minute hand (c) Hour hand

Indicate whether a debit or credit decreases the normal balance of each of the following accounts.

a. Service Revenue

b. Interest Payable

c. Accounts Receivable

d. Salaries Expense

e. Owner Capital

f. Prepaid Insurance

g. Buildings

h. Interest Revenue

i. Owner Withdrawals

j. Unearned Revenue

k. Accounts Payable

I. Land

No glass is perfectly transparent. Mainly because of reflections, about 92% of light passes through an average sheet of clear windowpane. The 8% loss is not noticed with a single sheet, but with several sheets it is apparent. How much light is transmitted by two sheets?

A butterfly at eye level is $20 \mathrm{~cm}$ in front of a plane mirror. You are behind the butterfly, $50 \mathrm{~cm}$ from the mirror. What is the distance between your eye and the image of the butterfly in the mirror?

Suppose you walk toward a mirror at 1 m/s. How fast do you and your image approach each other?

When you walk toward a mirror you see your image approaching you. If you walk at 2 m/s, how fast do you and your image approach each other?

Show that it would take about $2.5 \mathrm{~s}$ for a pulse of laser light to reach the Moon and to bounce back to Earth.

The vertical cross section of a cooling tower for a nuclear power plant is a truncated hyperbola. The diameter of the circular base of the tower is $100 \mathrm{ft}$. The diameter $100 \mathrm{ft}$ above the ground (the narrowest point) is $44 \mathrm{ft}$. Find the equation of vertical cross section of the cooling tower. Determine the approximate diameter of the top of the tower if it is $140 \mathrm{ft}$ high.

Convert the equation x + y = 2 to polar coordinates.

Convert the rectangular equation to a polar equation.

$$x+2y=3$$