Please tell me if any are wrong. Thankyou. I will give brainliest

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Can someone tell me if this is perpendicular? !

The graph below shows the line of best fit for data collected on the number of cell phones and cell phone cases sold at a local electronics store on twelve different days. number of cell phone cases sold 50 * 0 5 10 15 20 25 30 35 40 45 number of cell phones sold which of the following is the equation for the line of best fit? a. y = 0.8x b. y = 0.2x c. y=0.5x d. y = 0.25x