Which is the standard equation for a circle centered at the origin with radius r?

A. x2 + y2 = r

B. x2 = y2 + r2

C. x + y = r

D. x2 + y2 = r2

The cost to purchase x tickets for an amusement park is represented by the equations y-50x+3.75. how much would it cost to purchase 8 tickets?

If two instruments are in tune, what should their beat frequency be?

Order 0.40 mm, 40 mm, 0.4 mm, and 0.004 mm from most to least precise. a. 40 mm, 0.4 mm, 0.40 mm, 0.004 mm c. 0.4 mm, 0.40 mm, 0.004 mm, 40 mm b. 40 mm, 0.40 mm, 0.4 mm, 0.004 mm d. 0.004 mm, 0.40 mm, 0.4 mm, 40 mm

2thousand and 5 tens*10

Dose it. Equal 4/5 x 5/6 = 2/3

The box plots represent the ages of pennies in two 50-cent rolls. By looking at the plots, Beth says that the two means are about 5 years apart.

Which is bigger nine halves or nine quarters? How do you know?

In triangle abc, ab=90 in, bc=80 in, and angle b measures 50°. what is the approximate perimeter of the triangle? a) 242.4 in. b) 265.3 in. c) 308.3 in. d) 324.1 in.

The sum of two numbers is 180. one number is 5 times the number

What is the vertex of the parobala y = (x-5) (x-1)