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selena5713
28.11.2020 •
Mathematics
If × + y=8 & ×-y=2 , what is the value of ׳-y⁴??
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Ответ:
Step-by-step explanation:
x + y = 8(1)
x - y = 2(2)
solving Eqns (1) and (2) simultaneously:
Eqn(1) + Eqn(2)
x + x + y + (-y) = 8 + 2
2x = 10
x = 5
From Eqn (1)
y = 8 - x
y = 8 - 5 = 3.
Hence;
x^3 - y^4 = 5^3 - 3^4
= 125 - 81 = 44.
Ответ:
B
Explanation:
The fact that money "enables people to transfer purchasing power from the present to the future" refers to the STORE OF VALUE function of money.