<h2>Answer: 15/14</h2><h2>_____________________________________</h2><h3>Honey, all you need to do is substitute the value of the variable into the equation and simplify!</h3><h3>To get the answers:</h3><h3>Exact Form:</h3><h3>15/14</h3><h3>Decimal Form:</h3><h3>1.07142857…</h3><h3>Mixed Number Form:</h3><h3>1 1/14</h3><h2>_____________________________________</h2><h3>Hope you have a good day, Loves!~ <3</h3>
Answer: Mary covers less distance for 320 m
Step-by-step explanation:
Psqere=4a
Prect=2(a+b)
anna=4*4a (a=90m)
Anna=16*90=1440m
Mary=4*2(a+b)=8(a+b)=8*(80+60)=8*140=1120 m
anna-Mary=1440-1120=320m
Answer:
6 units
Step-by-step explanation:
Remember the formula for the area of a rectangle: A = lw
What we know:
A=48
w = l-2
Substitute A for 48 and w for l-2 into the equation
A = lw
48 = l(l-2) Use the distributive property. Multiply over the brackets.
48 = l² - 2l
Rearrange the equation to standard form (0 = ax² + bx + c) to use quadratic formula.
0 = l² - 2l - 48
a = 1 ; b = -2 ; c = -48 State the variables for the quadratic formula
Substitute a, b and c to find the length:

Simplify


Split the equation at the ± for adding and subtracting. Then decide which answer is correct, or if both of them are possible answers.


This is "inadmissable", or impossible because the length can't be a negative value.


Length of the rectangle
Use the formula for the area of a rectangle
Substitute the length and area, then isolate "w" for the width
A = lw
48 = (8)w
48/8 = w
w = 6
Therefore the length of the rectangle is 6 units.
25 is the answer for number 3
The volume of a cylinder is given by the formula <em>V</em>=π<em>r</em>²<em>h</em>². In this instance, <em>r</em> is 4 and the height is 47-12 (the height of the cone at the bottom is 12 mm and the sand goes up to 47 mm on the top portion of the hourglass, including both the cone and cylinder) or 35 mm.
<em>V</em>=π(4²)(35)=560π mm³.
The volume of a cone is given by the formula <em>V</em>=1/3π<em>r</em>²<em>h</em>². In this instance, <em>r</em> is 4 and the height is 12 mm.
<em>V</em>=1/3π(4²)(12)=π(1/3)(12)(4²)=π(4)(4²)=64π mm³.
This gives a total volume of 560π+64π=624π mm³ of sand.
Since the sand goes down to the bottom at a rate of 10π mm³/second, it will take 624π/10π=62.4 seconds for the sand to all drain out.