ElectricPavlov

...or maybe it is this:

(7+2x)   - 1/4x                   1/4 x less than the sum

7 +2x - 1/4x

7 + 1 3/4 x

or maybe you meant

1/4x < (7+2x)   Subtract 2x from both sides

-3 3/4 x <7        Divide both sides by - 3 3/4 (NOTE: this will REVERSE the < sign to > )

x > 7 / (3  3/4)

x > 28/15

x> 1  13/15

Crud....where is the remainder of your question?

Here is a few digits o 'e'

2.718281828459045235360287471352662497757247093699959574966967627724076630353 547594571382178525166427427466391932003059921817413596629043572900334295260

Here is a few digits of pi

3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825

And here is a calculator site:

https://defuse.ca/big-number-calculator.htm

Good luck on your strange quest !

Clarification

IF B is in degrees   then B = arcos (.2345) = 76.437 DEGREES

If B is in RADIANS    then arccos(.2345) = 1.334092132482  RADIANS

The question does not say if B is in degrees or radians!!!

Cos starts at 1   for 0 degrees and goes to    a value of zero  at 90 degrees.

You are incorrect Gibson, sorry      cos (76.437 DEGREES) = .2345     NOT .2345 degrees !!!

Your answer should be in radians ...not degrees

Sorry....I disagree Gibson    the .2345 is the cosine of B  which is only a numerical value between 1 and -1    B MIGHT BE in DEGREES OR RADIANS.....the question does not state which...I used the more common degrees.

arc cos b = b = arc cos .2345 = acos(.2345) = 76.437848672801 degrees

ph = -log(H3O)      which we assume will equal the HCl concentration as it is completely ionized

3.55 = - log (H3O)

10^(-3.55) = [H3O] = 10^(-3.55) = 0.0002818382931264 = 2.818 x 10^(-4) M