9 A scuba diver dove from the surface of the ocean to an elevation of -69, feet at a rate of -16.4 feet per
10
9
minute. After spending 12 minutes at that elevation, the diver ascended to an elevation of -8, feet. The
10
1
total time for the dive so far was 19 minutes. What was the rate of change in the diver's elevation during
8
the ascent? Round your answer to the nearest hundredth.
The rate of change of the diver's elevation was
ft/min.

0 is its x and y coordinate

answer: 72: 111

step-by-step explanation:

< xcy ≅ < xby

step-by-step explanation:

in δcax and δbax,

so, δcax ≅ δbax (side-angle-side or sas)

since δcax ≅ δbax, we can conclude < acx ≅ < abx

in δacy and δaby,

so, δacy ≅ δaby (side-angle-side or sas)

since δacy ≅ δaby, we can conclude < acy ≅ < aby

now,

< acy ≅ < aby

=> < acx + < xcy ≅ < abx + < xby

=> < acx + < xcy ≅ < acx + < xby   (since < acx ≅ < abx already proved above)

subtracting < acx from both sides, we get

< acx + < xcy -< acx ≅ < acx + < xby -< acx

cancelling out < acx and -< acx from both sides, we get

< xcy ≅ < xby (proved)