The answer is R=60... yu have to subtract 10r from both sides which then leaves you with -60=-1r. From that, you divide both sides by -1 which ends to giving your answer which is r=60
The area of the parallelogram is 26 × 10 = 260 cm^2 ; The area of equilateral triangle is 0.4 cm^2 ; <span>The </span>number<span> of triangles can Devi fit on the gris is 260 ÷ 0.4 = 260 × ( 10 / 4 ) = 2600 / 4 = 650 ;</span>
