Answer:
x = ± 6
Step-by-step explanation:
Given
x² + 64 = 100 ( subtract 64 from both sides )
x² = 36 ( take the square root of both sides )
x = ±
= ± 6
The ratio is 4:3:1
let the ratio be 4x:3x:x
according to the question,4x+3x+x=40
8x=40
x=5
therefore amount of gravel=x*4=5*4=20

amount of sand=5*3=15

amount of cement=5*1=5
Step-by-step explanation:
4x+28=5x+8
x=20
.............
Answer:
I think it would be 15
Step-by-step explanation:
Answer:
x=2
Step-by-step explanation: