So a mile has 5280 feet.
21,129/5280= 4 mph
multiply
4 x 2 = 8 miles in 2 hours
Answer:
x = -6 and y = 9
Step-by-step explanation:
It is given that,
0.12x - 0.07y = -1.35 -----(1)
0.4x + 0.8y = 4.8 -----(2)
<u>To find the value of x and y</u>
eq(1) * 100 ⇒
12x + 7y = -135 -----(3)
eq(2) /0.4 ⇒
x + 2y = 12 -----(4)
eq(4) * 12 ⇒
12x + 24y = 144 ---(5)
eq(5) - eq(3) ⇒
12x + 24y = 144 ---(5)
<u>12x - 7y = -135 </u> -----(3)
0 + 31y = 279
y = 279/31 = 9
Substitute the value of y in eq(4)
x + 2y = 12 -----(4)
x + 2*9 = 12
x = 12 - 18 = -6
Therefore x = -6 and y = 9
Answer:
sududueufddssiie yan sagot sure ako lagpas nako jaan ganyan sinagot ko
Answer:
40 miles per hour
Step-by-step explanation:
Driver a could be going 50 miles per hour
Driver c could be going 30 miles per hour
40 miles per hour is in the middle so that could be your answer
The amount of money she spends per year on utility bills for the air conditioner is; D: $176.40
<h3>How to solve algebra word problems? </h3>
We are told that;
Cost of running the air conditioner = 7 hours per day
Cost of running the air conditioner = 21 cents per hour = $0.21 per hr.
She runs it for four months at 7 hours per day. Thus;
Total number of hours for the 4 months = 7 × 30 × 4 = 840 hours
Total cost for the 4 months = $0.21 per hr. × 840 hours = $176.4
Read more about algebra word problems at; brainly.com/question/21405634
