Vertices (0,15) and (0, -15), conjugate axis of length 18 units
y x²
a.
1
225 81
y?
+
225
81
x2
b.
1
2
X
c.
= 1
225
81
y?
225
2
x
d.
=1
324

40 minutes

step-by-step explanation:

add the time and multiply by 2

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

mathpapa

step-by-step explanation: