Answer:
7
Step-by-step explanation:
21=3x
x=7
Answer:
lines 2 and 4 are perpendicular
Step-by-step explanation:
if the slopes of two lines are opposed reciprocals, they are perpendicular. in this case the slope of line 2 is -1/2 and the slope of line 4 is 2 after you solve for y=mx+b form
The hours worked at the babysitting job is 6 hours.
The hours worked at the barber shop is 3 hours.
<h3>What are the hours worked at the babysitting job?</h3>
Given the two linear equations:
x + y = 9 equation 1
15x + 9y = 117 equation 2
Multiply equation 1 by 9
9x + 9y = 81 equation 3
Subtract equation 3 from 1
36 = 6x
x = 6
<h3>What are the hours worked at the barber shop?</h3>
Substitute for x in equation 1
6 + y = 9
y = 9 - 6
y = 3 hours
To learn more about simultaneous equations, please check: brainly.com/question/25875552
-1/2 is what I would choose.
3 5/7 x 2 6/7
= 3.71428564 x 2.8571428
= 10.6 ft^2 (3 sig. fig.)