Express (158 lb)2 to three significant figures with appropriate units

2.50 × 10⁴

Justification:

1) The expression is: (158 lbs)²

2) When two amounts are multiplied, the product must be shown with the same number of significant figures of that of the factor with the least number of significant figures.

3) So you have to muliply 158 by itself (square) and then round to 3 significant figures.

4) The number 158 has 3 significan figures, so the product shall show also 3 significant figures:

(158 lb)² = 158 lb × 158 lb = 24,964 lb², which must be rounded to 3 significant figures: 25,000.

Since, the fourth figure was greater than 5, the third signficant figure must be increased. Since the third signficant figure is 9, the increase is translated to the second significant figure.

5) Now, to indicate tha the number of significan figures is 3, you have to use scientific notation:

25,000 = 2.50 × 10³, where the 3 signficant figures are 2, 5, and 0.

they both have a y in them

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.