T = 2 and t=0
i hope this helped. if i did it wrong i apologize.
<span>Let x = the miles Jeanie ran
y = the miles Jeanie biked
T = 2 hours total time for the duathlon
v1 = 8.5 mph Jeanie's running speed and
v2 = 16 mph Jeanie's biking speed
But T = Jean's time she ran t1 + time she biked t2 I. e t1 + t2 = 2
So we have average speed v2 when she biked = distance (y) / time (t2)
Distance y = v2 * t2 = 16 * t2 and distance when she ran x = 8.5 * t1
Since she covered 27 miles while running and biking we have
x + y = 27
8.5t1 + 16t2 =27 ------(1)
t1 + t2 = 2 --------------(2)
The simultaneous equation gives us
t1 = 2/3 and t2 which is time she biked = 4/3
So 4/3 = 1 1/3. Which is 1 hour 20 minutes</span>
Answer:
i think the answer would be 7 8/9
Step-by-step explanation:
Y = x - 7....so sub in x - 7 for y in the other equation
5x + 2y = 7
5x + 2(x - 7) = 7
5x + 2x - 14 = 7
5x + 2x = 7 + 14
7x = 21
x = 21/7
x = 3
y = x - 7
y = 3 - 7
y = -4
solution is (3,-4)
<span>A
recipe that serves 2 people needs 1 600 milligrams of baking soda.
Then you want to make for 10 people.
Find out how many grams will you need to be able to have this recipe for 10
people.
=> in every 2 people needs 1600 mg of baking soda
=> 10 / 2 = 5
=> 5 x 1600 = 8000 mg of baking soda will be enough for 10 persons.
convert this to grams
=> 8 000 mg = 8 grams.</span>