Help a girl out plz

k = -10

Step-by-step explanation:

-6/5 = - 1 1/5

Since -6/5 is a negative, you must multiply it with another negative. Or you can put -6/5 as a positive.

First, notice that 1 1/5 would make a whole number (with no fraction) with something in the 5s. 1 times 10 = 10 (-1 times -10 =10) and 1/5 times 10 = 2 (-1/5 times -10 = 2) Finally, put those together to get 12.

26 is 33.33% of 78

step-by-step explanation:

26 is what percent of 78?

26 is p% of 78

equation: y = p% * x

solving our equation for p

p% = y/x

p% = 26/78

p = 0.3333

convert decimal to percent:

p% = 0.3333 * 100 = 33.33%

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