Consider a value to be significantly low if it’s z score less than or equal to -2 or consider a value to be significantly high if it’s z score is greater than or equal to 2. A test is used to assess readiness for college l. In a recent year, the mean test score was 20.2 and the standard deviation was 4.6. Identify the test scores that are significantly low or significantly high. A. Test scores that are greater than __.
B. Test scores that are between __ and __.
C. Test scores that are leas than __.

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

sina-sinb

cosb+cosa

tana-tanb

cos0+cos x pi/3

20tan

step-by-step explanation:

5 feet of chain cost $9

so the answer is 1.80