Let x sq. ft be the <u>area</u> Melinda <u>shovels per minute</u> and y sq. ft be the area Paul shovels per minute.
1. Together they shoveled 450 square feet of sidewalk in 30 minutes, then
30x+30y=450.
2. Melinda shoveled for 20 minutes while Paul shoveled for 25 minutes to complete 345 square feet of driveway. Then
20x+25y=345.
3. Solve the system of equations:
Divide the first equation by 30 and the second one by 5:
From the first equation and
Then
Paul can shovel more than Melinda can.
9 I pretty sure :) this is the answer bc if yousimplify add 5 to both sides multiply by 3 and divide by2 it is 9
Visualize one train going north and the other going south. To determine their distance apart, we could add the distance one train travels north to the distance that the other train travels south.
Thus, |62 kph * t| + |68 kph * t] = 455 km (Seems that you may be mixing km with miles; can't do that; choose one or the other.)
Then
455 km
------------------------ = t = 3.5 hours
(62 kph + 68 kph)
<em>Greetings from Brasil... </em>
25mg is recommended, but the minimum for the label would be 10% of 25mg. So just apply percentage (rule of 3)
mg %
25 -------- 100
X -------- 10
100 · X = 25 · 10
100X = 250
X = 250/100
<h2>X = 2.5</h2>
So, it is enough that the product has 2.5mg of iron to be labeled as a "Good Source of Iron"
Answer:
Step-by-step explanation:
Given
and we know
-------1
as it is given
A and B are independent therefore
Substitute value of in 1
on solving