Xio just took a math test with 25 questions, each worth an equal number of points. The test is worth 100 points total. If a score of 70 points earns a grade of C, how many questions would Xio need to get right to get a grade of C on the test? A. 17
B. 19
C. 20
D. 18

i can answer this question sweetie!

step-by-step explanation:

need points to ask question

step-by-step explanation:

98%

step-by-step explanation:

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