Which system of equations is in standard form?

Find the lengths of the diagonals of this trapezoid.

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle