17+42=59
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What is exercise 5 that would be easier
It is used to show the inverse (opposite of a number) in algebra.
Well, honey, 7 x 8 is definitely a number sentence. It's just a multiplication problem, not a full equation. A number sentence typically includes an equal sign, showing a relationship between two expressions. But in this case, 7 x 8 is just a standalone multiplication operation.
arcsine Some calculators show it as SIN-1.
Yes, that's what we mean by "-y" or "negative y" -- it's the additive inverse of y. -y is defined as the number which, when added to y, gives zero. y + -y = 0 (Zero, in turn, is defined as the additive identity -- the number which, when added to x, gives x.)