Ineed on this problem
20 ÷ (4 - (10 - 8))

10

Explanation:

20 ÷ (4- (10-8))

First off, you work your way outward. You start the furthest in, then head your way out. (10 - 8) is the furthest in, and 10 - 8 = 2. So now your equation looks like this:

20  ÷ (4 - 2)

Next, you do the (4 - 2) which equals 2. So now, the equation is this:

20  ÷ 2

So you finish it up with 20  ÷ 2 which equals 10.

Hope I made sense! :D

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'.

5x+10 is the correct one

hope this