Consider the two triangles. To prove that the triangles are similar by the SAS similarity theorem, it needs to be shown that
A. ZC = ZC
B. ZC = ZG
C. AC/GI = HI/BC
D. AC/GI = BC/HI

What is sin 7x/4 ? i need on this urgent trig

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.