2 answers:
Answer:
x=9
Step-by-step explanation:
We can use similar triangles and ratios. Put the small triangle side over the large triangle side.
9cm 3x -20
---------- = ---------------- We need to add the sides to get to the larger triangle
72+9 cm 3x-20 + 56
We can cross multiply to solve
9 * (3x-20+56) = (72+9) * (3x-20)
Simplify
9*(3x+36) = 81*(3x-20)
Distribute
27x +324 = 243x -1620
Subtract 27x from each side
27x-27x +324 = 243x-27x -1620
324 = 216x-1620
Add 1620 to each side
324+1620 = 216x
1944 = 216x
Divide each side by 216
1944/216 = 216x/216
9=x
Answer:
im not great at math but i think x=9
Step-by-step explanation:
9/72=0.125
72*0.125=9
so 56*0.125=7
therefore 3x-20=7
solve for x
3x - 20 = 7
3x = 7 + 20
3x = 27 (divide both sides by 3 to get x)
3x/3 = 27/3
x = 9
......
.......
or you can try
56/72=0.77777777777
72*0.77777777777=56
so 9*0.77777777777=7
therfore 3x-20=7
solve for x
3x - 20 = 7
3x = 7 + 20
3x = 27 (divide both sides by 3 to get x)
3x/3 = 27/3
x = 9
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Answer:
Step-by-step explanation:
1. -7 = w + 5
w = -12
(-12 + 5 = -7)
2. -4p + 38 = 10
-38 -38
-4p = -28
/-4 /-4
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/1.25 /1.25
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