On Saturday, Casey earns $15 babysitting. On Sunday, she receives $68 for her birthday. Casey purchases a belt for $11.50, a sweater for $23.24, and a pair of jeans for $29.99. She deposits the remaining money into
her savings account. If Casey had a balance of $37.23 in her savings account before making her deposit, how
much money does she currently have in her savings account?

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

answer: chelsea has 55 brushes

step-by-step explanation:

5 x 11 = 55

5 + 55 = 60

i dont know this one sorry