The phrase "a host of formulae" is correct and usable in written English.
It can be used to refer to a large number of formulas, often in a mathematical or scientific context.
Example: "In this research paper, we will explore a host of formulae that can be applied to solve complex equations."
Alternatives: "a multitude of formulas" or "a variety of formulas."
Meanwhile, Honda says it will make a host of improvements to its latest Formula 1 engine in time for the next pre-season test in Barcelona.
Following research efforts by Mann [11], Krasnoselskii [12], Schaefer [13], Ishikawa [14], Edelstein [15 17], Reinermann [18], Edelstein and O'Brian [17], Chidume [19], and a host of other authors, the following recursion formula was developed and found to be effective for approximating fixed points of nonexpansive mappings.
The council listed a host of weak spots in the system: rate formulas that encouraged utilities to upgrade transmission but that did not reflect risks in the new markets; companies making money from pushing the limits of the reliability rules; and "reliability responsibilities" being divided among many entities because the integrated utilities had been broken up.
From there it's a host of smaller changes and fixes to the PES formula, building on PES 2015's fine in-game action and resulting in something that immediately feels impressive, vital and surprisingly different.
It is no secret that a host of the top European clubs have been searching for a formula to crack the United States market in big, sustainable ways.
They're developing a host of products, including robotics-enabled baby swings, smart monitors that track vital signs and formula customized for the needs of ill and premature infants.
A baseball statistician who began analyzing political polls only last year, he introduced his site, FiveThirtyEight.com, in March, where he used his own formula to predict federal and state results and run Election Day possibilities based on a host of factors.
