y varies directly as x
y=kx, where k is any constant
y = 4 when x=-2
4 = k (-2)
4 =-2k
k=-2
Therefore, y=-2x
When x=30
y = -2(30) = -60
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The answer is x=10. If: x=20 y=8 z=4 then: y=8/2=4 z=4*2=8 since x varies directly with y, meaning whatever happens to y, happens to x, so if y was divided by 2, then x should be divided by 2. After all, the inverse of division is multiplication.
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is it 5/8x or 5x/8 let me solve both ways for 5/8x = 30 then x = 1/48 for 5x/8 = 30 x = 48
x = 75
If you mean adding in groups, I suppose you could break 34 into 30 and 4. Then you could add 9 to 4 to get 12, and then perhaps more easily add 13 and 30 to get 43.
As x ∝ yz2 then x = kyz2 where k is a constant. Substituting the given figures, 40 = k*20*22 = 80k Then k = ½ and the formula is, x = ½yz2 So, x = ½ * 30 *32 = 135
49 - 30 equals = 19
x equals 6 5 times 6 equals 30
"30 percent of 122 equals 85.4" is false. 30 percent of 122 equals 36.6.
30/1 is one improper fraction that equals 30.
120 divided by 30 equals four.
5.477225575 squared equals 30.