Which of the choices best describes this arithmetic sequence?
-2, 1,4,7, 10, ...

1

Step-by-step explanation:

An arithmetic sequence is a sequence in which each term after the first is found by adding a comstant, called the common difference d, to the previous term. The set of positive odd numbers, 1, 3, 5, 7, ... , is a sequence. The first term, a1, is 1 and each term is 2 greater than the preceding term.

b. an equilateral triangle inscribed in a circle

step-by-step explanation:

we are given the figure of two circles having a triangle inside.

now, we know that,

"when a figure is lying inside an another figure, then the outside figure is known as circumscribed figure and the figure lying inside is referred to as the inscribed figure".

as we see that, the circles are containing the triangle completely.

thus, the circles are the circumscribed figures and the triangle is the inscribed figure.

hence, we get, 'an equilateral triangle is inscribed in a circle'.