Question

A closed top cylindrical tank will be built $$30$$ ft high with a diameter of $$60$$ ft. The material for the tank is $$\frac{3}{8}$$ inch thick steel which costs $$ \$19$$ per square foot.  Which expression will give the correct cost of the steel?     

*Note:*  $$ A_{circle} = \pi r^2$$ ;  $$A_{cylinder\; lateral\; area}= \pi d h$$)

Accepted Answer

$$ \$19 \cdot 3600 \pi $$

Answer

$$ \dfrac{3}{8} \cdot \$19 \cdot 3600 \pi $$

Answer

$$ \dfrac{3}{8} \cdot \$19 \cdot 1800 \pi $$

Answer

$$ \$19 \cdot 1800 \pi $$

Question 34 - Upper Level: Mathematics Achievement Practice Test for the ISEE