Marco bought 15mL of kerosene and diluted it with 55 mL of water. What is the percent by volume of the water? plz help me i will mark the BRAINLIEST PLZ WITH SOLUTION

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

Complete the table for different values of x in the polynomial expression -7x2 + 32x + 240. then, determine the optimal price that the taco truck should sell its tacos for. assume whole dollar amounts for the tacos.

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)