Find an equation of the circle that satisfies the given conditions. Center (7,-3); tangent to the x-axis.

Find an equation of the circle that satisfies the given conditions.

Center (-a, a) and radius 2a

Find the coordinates of the center of a circle that is tangent to the y-axis and intersects the x-axis at (8, 0) and (18, 0).

Suppose you were showing around a new arrival from Cuba or China. Where might you go in order to point out the differences between their economic system and ours?

Find the standard equation of the sphere. Center: (-3, 2, 4), tangent to the yz-plane

Find an equation of the line that satisfies the given conditions.

Find YZ

Solve the linear system using elimination.

$$\left. \begin{array} { l } { 9 x - 8 y = 4 } \\ { 2 x - 3 y = - 4 } \end{array} \right.$$

Suppose that Adam hits a golf ball off a cliff 300 meters high with an initial speed of 40 meters per second at an angle of $45^{\circ}$ to the horizontal. Find parametric equations that model the position of the ball as a function of time.

Find an equation of the circle that satisfies the given conditions. Center (-1, 5); passes through (-4, -6)

Find an equation of the circle that satisfies the given conditions. Endpoints of a diameter are P(-1, 3) and Q(7, -5)

Write true if the statement is true. If it is false, change the underlined word or words to make the statement true. Most $\underline{\text{decomposers}}$ make their own food by photosynthesis.

The distance between the points (a, b) and (c, d) is ____. So the distance between (1, 2) and (7, 10) is ____.

Why was it risky for the Galileo spacecraft to fly close to lo?