Answer:
x = -0.357143
Step-by-step explanation:
Step 1: Write equation
18 - 7x = 20.5
Step 2: Solve for <em>x</em>
<u>Subtract 18 on both sides:</u> -7x = 2.5
<u>Divide both sides by -7:</u> x = -0.357143
Answer:
106 km / hour
Step-by-step explanation:
Givens
Total time: 6 hours
Total distance: 1356 km
First bus rate: r
Second bus rate: r - 14
Formula
d = r * t
Solution
r*6 + (r - 14)*6 = 1356 Remove the brackets
6*r + 6*r - 84 = 1356 Add like terms
12r - 84 = 1356 Add 84 to both sides
12r + 84 - 84 = 1356-84 Combine
12r = 1272 Divide by 12
r = 1272/12
r = 106 km/hr
Answer:
The first graph in the top left hand corner
Step-by-step explanation:
<span>(-a + 3)(a + 4) = -a</span>² -4a +3a +12 = -a² - a + 12
Answer:
n = 13
Step-by-step explanation:
20= -6+2n
Add 6 to each side
20+6= -6+6+2n
26 = 2n
Divide each side by 2
26/2 = 2n/2
13 =n