Answer:
C: 
Step-by-step explanation:
Amplitude is changed by multiplying the entire trig function by a number, by default the amplitude is 1, so multiplying by 6 is necessary; eliminate A and B
Horizontal shift is going through the x axis, so it must be subtracted from the x value. This is only seen in choice C of the remaining answers.
Calculating the period isn't necessary because we already found the right answer but in case you need it in the future; the period is by default 2pi, to get to pi/4, it had to be 8 times smaller, so multiplying x and translations on x by 8 will get you the correct period.
The answer is A. because for you to find the answer you have to subtract so it would be 55.75-12.5=43.25
Answer:
y = 2/3x + 4
Step-by-step explanation:
y = mx + b
m= 4/6 (y intercept over x intercept)
simplify
m= 2/3
b= 4 (y intercept)
550+450-120+720=1,600
720/1,600*100%
=720/160%
=45%
therefore, 45% of new balance