The value of x in, 3:5=15:x is ___.
Given,
3:5=15:x 35=15x x=15×53 x=25
Therefore, the value of x is 25.
In a quadrilateral ABCD, ∠A=90∘, ∠B=3x, ∠C=3x+5, ∠D=8x−15. Then the value of ∠D is
Tick (✓) the correct answer in each of the following:
(x+5)(x−3)=?
(a) x2+5x−15 (b) x2−3x−15 (c) x2+2x+15 (d) x2+2x−15