Answer:
There area 14 one cent stamps
Step-by-step explanation:
Let
x -----> the number of 1 cent stamps
y -----> the number of 8 cent stamps
z -----> the number of 12 cent stamps
we know that
0.01x+0.08y+0.12z=1.78 -------> equation A
x=y+4 ------> y=x-4 -----> equation B
x=2z -----> z=0.5x ------> equation C
substitute equation B and equation C in equation A and solve for x
0.01x+0.08(x-4)+0.12(0.5x)=1.78
0.01x+0.08x-0.32+0.06x=1.78
0.15x=1.78 +0.32
0.15x=2.10
x=14
therefore
There area 14 one cent stamps
Answer:
6
Step-by-step explanation:
Y is directly proportional to 1/x2
Y = k/x2
Where k is the proportionality constant
y1*(x1)2 = y2*(x2)2
7.2*(10)2 = 20*(x2)2
x2 = sqrt(36)
X = 6
Answer:
17
Step-by-step explanation:
42+x=5x
-5 - 5
=17
Step-by-step explanation:
Use the slope-intercept form to find the slope and y-intercept.
Tap for more steps...
Slope: −2-2
y-intercept: 11
Any line can be graphed using two points. Select two xx values, and plug them into the equation to find the corresponding yy values.
Tap for more steps...
xy011−1xy011-1
Graph the line using the slope and the y-intercept, or the points.
Slope: −2-2
y-intercept: 11
xy011−1xy011-1

Answer:
39 feet.
Step-by-step explanation:
E use the Pythagoras theorem:
40^2 = 8^2 + h^2 as h is the height we require.
h^2 = 1600 - 64
h^2 = 1536
h = 39.19 feet
