There are 15 teachers who teach Mathematics or Science in a School Of these 11,teach Mathematics and 3teach Mathematics and Science How many teach Science ?

1 teacher teaches Science.

Step-by-step explanation:

If 11 teach math and 3 teach math and science, the number of teachers that teach only science will be...

Total- (only math + math and science)

15 - (11 + 3)

15 - 14

= 1 teacher

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the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places