Mr Pretorius starts an investment with a deposit of R60 000 . Three years later he deposits another R40 000. Exactly 4 years after he started the investment, he withdraws R15 000 . F the first 3 years, interest is calculated at 5,5\% p.a. compounded semi-annually and thereafte it is calculated at \( 6 \% \) p.a, compounded quarterly. What is the value of the investment exactl 5 years after the first deposit?

Simplify the expression \( 4 \cdot 8^{-1}+16^{0} \) Select one: a. 33 b. 32 o c. \( 2 / 3 \) od. \( 3 / 2 \)

Write the number in scientific notation: \( 43,000,000 \) Select one: a. \( 43 \times 10^{8} \) b. \( 4.3 \times 10^{6} \) c. \( 4.3 \times 10^{-7} \) d. \( 4.3 \times 10^{7} \)

\( \mathrm{A}(1 ; 2) \) e \( \mathrm{B}(1 ; 1) \) è:

Calcula estas operaciones de dos maneras, utilizando la pro- piedad distributiva: a] \( (-7) \cdot[(-1)+(+11)] \) b] \( [(+22)-(-18)] \cdot(+8) \)

Simplify the expression and write the answer with positive exponents only \( \left(\left(6 a^{-5} b\right) /\left(8 a b^{-2}\right)\right)^{-2} \) Select one: a. \( 4 b^{6} / 3 a^{12} \) b. \( 9 b^{6} / 16 a^{12} \) c. \( 3 a^{12} / 4 b^{6} \) d. \( 16 a^{12} / 9 b^{6} \)