With regard to mathematics, what is an accepted statement of fact that is used to prove other statements?

what % of 400 = 193

A new pencil was 18 cm long. Now it measures 12.7 cm. How many centimeters of the pencil have been used?

What is the maximum possible value of 13.7

All lines measure exactly 150?

How do you solve a quadratic formula

75% of 84 is what number

People may be reluctant to give up fast food, steaks, burgers, and ice cream shakes for veggies and fruit. But consider the health issues that America's bad eating habits have caused: heart disease, obesity, and type 2 diabetes.

What is the solution to the following system? 3x+3y=10 -9x-9y=-30

The sum of x and 3 is divided by 2

Caitlin is 62 1/4 inches tall. Her older brother Jaime is 9 1/2 inches taller than Caitlin. Jaime is 2 1/4 inches shorter than their father. How tall is their father?