Why at is 4x^2 -24x+7=3

What is the measure of x? 43° 86° 172° 344°

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g