Isabella bought school supplies at the store. She chose a notebook for $3.99, 2 pencils that each cost $1.09, and 1 package of markers for $5.25. What is the BEST estimate of the total cost of these items before tax?

$1.09 x 2 = $2.18. $2.18 + $3.99 = $6.17. $6.17 + $5.25 = $11.42. So, the best estimate of total cost (excluding tax) equals $11.42.

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq

1 x=22.52

2: 65/39=604+39x

65x-39x=604

26x=604

x=604/26

×=23.23