The yearly interest charged on this loan is the annual interest rate multiplied by the amount borrowed:

interest = annual interest rate x loan amount

i = (\( \frac{6}{100} \)) x $100
i = 0.04 x $100
i = $4

The distributive property for division helps in solving expressions like \({b + c \over a}\). It specifies that the result of dividing a fraction with multiple terms in the numerator and one term in the denominator can be obtained by dividing each term individually and then totaling the results: \({b + c \over a} = {b \over a} + {c \over a}\). For example, \({a^3 + 6a^2 \over a^2} = {a^3 \over a^2} + {6a^2 \over a^2} = a + 6\).

To multiply terms with radicals, multiply the coefficients and radicands separately:

3\( \sqrt{7} \) x 5\( \sqrt{3} \)
(3 x 5)\( \sqrt{7 \times 3} \)
15\( \sqrt{21} \)

By buying two shirts, Alex will save $38 x \( \frac{40}{100} \) = \( \frac{$38 x 40}{100} \) = \( \frac{$1520}{100} \) = $15.20 on the second shirt.

To add or subtract terms with exponents, both the base and the exponent must be the same. In this case they are so subtract the coefficients and retain the base and exponent:

7z³ - 5z³
(7 - 5)z³
2z³