What two incentives did the federal government give the railroads to build a transcontinental?

What is the approximate area of a circle with a radius of 15 feet

Which historical interpretation is supported by this source?

Which best describes the effects of the red scare in texas during 1920s? a. many communists from large texas cities were exposed.b. texans decided to force unions out of the state.c. texans were not greatly affected because the state had few unionists and/or communists.d. unions became more popular in taxes as a result of the red scare.