The 1960s and 1970s gave rise to the use of , where federal regulations were enacted that states were required to implement but without money from the federal government to do so.

Federal Unfunded Mandates

Explanation:

The 1960s and 1970s gave rise to the use of FEDERAL UNFUNDED MANDATES where federal regulations were enacted that states were required to implement but without money from the federal government to do so.

For example, the Amendments to the Clean Air Act in 1970 led to the formation of the National Ambient Air Quality Standards, which then regulated the provisions for control of motor vehicle emissions, intensified the federal enforcement authority but required only the STATES to ENFORCE and FUND the plans to stick to these measures.

254.34

step-by-step explanation:

the formula for area of a circle is given by

a = pi * r^2

a = pi * 9^2

a = 81*pi

using 3.14 as an approximation for pi

a = 3.14*81

a = 254.34