What is 3x(5x+7) do you know

Im literally having a mental breakdown

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.