Answer:
.000039
Step-by-step explanation:
When dividing by a power of 10, we move the decimal to the left
There are 5 zero's , so move it to the left 5 places
Add zeros if necessary
3.9 becomes .000039
Answer:
c
Step-by-step explanation:
bu step explanatiob by 3
Angie made an error because she used substitution incorrectly in step 3.
<h3>System of equation </h3>
7x + y =−12
7x + 4y = −6
subtract equation(i) from (ii) to eliminate x
Therefore,
3y = 6
y = 6 / 3
y = 2
Therefore,
7x + 2 = -12
subtract 2 from both sides of the equation
7x = -12 - 2
7x = - 14
x = - 14 / 7
x = -2
(-2, 2)
Therefore, Angie use substitution incorrectly in step 3.
learn more on system of equation here: brainly.com/question/1818941