So basically you need to multiply 3000x4000 in two ways? If so you can use basic multiplication and an area model
Good evening.
This is a
incomplete quadratic equation, because it does not have the term
bx. Therefore, we can solve this faster with the following strategy:

Add
16 to both sides:

Take the square root:

Therefore:
X=7 because 7-3 = 4, 7+8= 15,15x4=60.
Answer:
1) c=.07h+15.25 is the answer.
Three decimals:
5.414
5.415
5.416
Ordered decimals:
5.414,5.415,5.416,5.417,5.418