Achemical engineer has tested 56 water samples. these samples make up 25% of the total number of samples that need testing. select from the drop-down menu to correctly identify the total number of water samples that need testing. there are a total of water samples to be tested. a: 1.4 b: 14 c: 168 d: 224

The total number of water samples to be tested are 224 .

Option (D) is correct .

Step-by-step explanation:

Formula

As given

A chemical engineer has tested 56 water samples.

These samples make up 25% of the total number of samples that need testing.

Part value = 56

Percentage = 25%

Put all the values in the formula

Total value = 224

Therefore total number of water samples to be tested are 224 .

Option (D) is correct .

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

u what ?

step-by-step explanation: