Find the difference -7 - (-2)

-5

Step-by-step explanation:

-7 - (-2)

Subtracting a negative is like adding

-7 +2

Since the signs are different, we subtract and take the sign of the larger

7-2 = 5

The 7 is the larger number and it is negative

-5

(x, y)→(x − 8, y − 7)

step-by-step explanation:

enjoy!

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