Answer:
y = 1/3x + 4/7
Step-by-step explanation:
Slope Formula: 
Slope-Intercept Formula: y = mx + b
Step 1: Find slope <em>m</em>
m = (1 - 2)/(-3 - 4)
m = -1/-7
m = 1/7
y = 1/7x + b
Step 2: Find y-intercept <em>b</em>
1 = 1/7(3) + b
1 = 3/7 + b
b = 4/7
Step 3: Write linear equation
y = 1/3x + 4/7
The surface areas of similar solids is proportional to the square of their sides
<span>since the ratio of sides is 1 : 3 </span>
<span>their surface areas have the ratio 1</span>²<span>: 3</span>²<span> or 1:9 </span>
<span>so the surface area is 9(10.4) or 93.6 </span>
<span>or </span>
<span>original width = x </span>
<span>original length = y </span>
<span>original heigt = z </span>
<span>original surface area = 2(xy) + 2(xz) + 2(yz) </span>
<span>= 2(xy + xz + yz) </span>
<span>new width = 3x </span>
<span>new length = 3y </span>
<span>new height = 3z </span>
<span>new surface area = 2(9xy) + 2(9xz) + 2(9yz) </span>
<span>= 18(xy + xz + yz) </span>
<span>ratio of new to old = 18(xy + xz + yz) : 2(xy + xz + yz) </span>
<span>= 9:1</span>
Answer:
you basically do the same things just backwards
Step-by-step explanation:
for example 9+9=18 well to double check your work all you do is flip to equation 18-9=9
Evaluate the trigonometric expression using sum and difference formulas.
Answer:
Step-by-step explanation:
1) we know that
Sally can paint the wall in 54 minutes
so
The 100% of the wall ------> she can paint in 54 minutes
by proportion
calculate how much is the percent of the work in 36 minutes
That means
Sally in 36 minutes can paint the 66.67% of the wall
2) Sally and Ethan work together, they can paint the wall in 36 minutes
so
Ethan in 36 minutes can paint (100%-66.67%)=33.33%
by proportion
Calculate how much time does it take for Ethan to paint the wall by herself
