Jet streams are fast flowing, narrow, meandering air currents in the atmospheres of some planets, including Earth. On Earth, the main jet streams are located near the altitude of the tropopause and are westerly winds (flowing west to east). Their paths typically have a meandering shape.
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Step-by-step explanation:
Their sum :
(a-3d)+(a-d)+(a+d)+(a+3d)=28
4a = 28
a=7.
2.Their product
(a-3d)²+(a-d)²+(a+d)²+(a+3d)²=216
4a²+20d²=216
a² + 5d² = 54
Putting the value of a
49 + 5d² = 54
5d² = 5
d² = 1
d=±1.
Hence, the numbers are 4, 6, 8 & 10.
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can u explain me the last step
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