bvallinab
12.12.2020 •
Mathematics
Determine which equation below have x = 15 as a solution.
A.
3x = 15
B.
x – 12 = 27
C.
4 + x = 19
D.
x
_
3= 1.5
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Ответ:
C, 4+x=15
Step-by-step explanation:
since you're trying to find x you need to isolate it, so use the other numbers you have, 19 and 4, subtract 4 from 19, (19-4) to get x=15.
Ответ:
D. x = 5.4, y = 6.67
Step-by-step explanation:
The triangles are similar as per problem description, so the ratios match:
y/5 = 4/3
x/3 = 9/5
let's solve:
y/5 = 4/3
3y/5 = 4
3y = 20
y = 6.(6)
x/3 = 9/5
5x/3 = 9
5x = 27
x = 5.4