Answer:
equilateral triangle
equilateral triangles are triangles with three equal sides
equiangular triangles are triangles where all e angles are the same
#7 is the easiest one.
a + bi = -9 + 4i
see the expression on either side matches up so..
a = -9 and b = 4
It is given in the question that
Jess has dinner at a restaurant. The dinner bill is B dollars. She pays a 21% tip.
THerefore,
Jess's bill amount without tip is $ B.
Jess's tip amount is 21 % of B or 0.21B
THerefore Jess's total amount is the sum of Jess's bill amount without tip and Jess's tip amount, that is

Hence, Jess's total amount is 1.21B .