Find the equivalent fractions by using multiplication. then solve addition problem on right substituting equivalent fraction with the common denominator

First one: 3/4 = __/8 

to get 8, they did 4*2 
so whatever you do to the bottom, you do to the top
3*2=6 
the first answer is - 3/4 = 6/8

the second one: 3/8 + 3/4 
we need to find the LCD (Lowest Common Denominator) 
 3/8 = 8,16,
3/4= 4,8

the LCD is 8, now we just need to add the numerators 

3/8 + 3/8 = 9/8

we could covert it into a mixed fraction 

9/8 = 1 1/8

i hope this helped!!

Intersecting secant-tangent theorem states that if a tangent segment and a secant segment are drawn to a circle from an exterior point, then the square of the measure of the tangent segment is equal to the product of the measures of the secant segment and its external secant segment.so to break it down: 1. pq acts as the tangent and ps as the secant with an intersection at p.sr = 21rp = 3x + 3pq = 4x + 4following to equation: tangent squared = the two segments multiplied by each otherso (4x + 4) ^ 2 = (3x + 3) • (21) simplifies to 16x^2 - 31x - 47 = 0 or (16x - 47)(x + 1) x = -1 or x = 47/162. pq acts as the tangent and ps as the secant with an intersection at p (again! )sr = 16rp = xpq = 15(15) ^ 2 = 16 • x225 = 16xx = 225/163. the interesting chords are proportional to each other so a ratio is possible to set up: ap dp 10 3 + x = = —— = pc pb 8 xcross multiple to get 10x = (3 + x)(8)x = 12