Answer:$43.69
She is incorrect. The mistake she made was adding $9.5 instead of taking 9.5% from the $39.90 and adding it to the initial total. The correct answer is actually $43.69. To find sales tax add your two starting prices and simply find the percent your looking for and add it to the original total
The answer for 8j-k+14 is 15
Answer:
The equation is:

and a beam with 10 in diagonal will support 300 lb
Step-by-step explanation:
The mathematical expression that represents the statement:
"The maximum load a beam will support varies directly with the square of the diagonal of the beam’s cross-section. "
can be written as:

where k is the constant of proportionality
To find the constant we use the data they provide: "A beam with diagonal 6 in will support a maximum load of 108 lb.":

Now we can use the proportionality found above to find the maximum load for a 10 in diagonal beam:

I think it's false. I think more than 7%
Answer:
z=44/3
Step-by-step
Subtract the numbers 52-12=40
3z-4=40
Add 4 to both sides
3z-4+4=40+4
SImplify
3z=44
Divide both sides by 3
3z/3 = 44/3
z=44/3 or decimal form= 14.66