13 Jo is making cordial. She follows the instructions and mixes 100 mL of cordial concentrate
with 400 mL of water.
(a) What percentage of the total mixture is concentrate?
(b) Jo decides the cordial is too weak. She adds another 50 mL of concentrate.
What fraction of the resulting mixture is concentrate?

What is the volume of a rectangular crate that has dimensions 9 inches by 9 inches by 1 feet? 1,458 in.3 121.5 in.3 1,012.5 in.3 36 in.3

A3cm×3cm\greend{3\,\text{cm} \times 3\,\text{cm}} 3cm×3cm start color greend, 3, space, c, m, times, 3, space, c, m, end color greend rectangle sits inside a circle with radius of 4cm\blued{4\,\text{cm}} 4cm start color blued, 4, space, c, m, end color blued . what is the area of the shaded region? round your final answer to the nearest hundredth.

When solving a logarithm equation, how do you find the missing variable ?