For the middle sections, you can use the area of a trapezoid: 1/2(h1+h2)b
1/2(1.25+2)1=1.625
The two triangles can form a square
1.25*1.75=2.1875
Add it all together
1.625+1.625+2.1875=5.4375
Answer:
1.
Step-by-step explanation:
1. 2x-4=10
2x=14
x=7
2. 3x+3=2x-1
3x-2x=-1-3
x=-4
3. 7x+x=24
8x=24
x=3(
4. 5+x=-18
x=-18-5
x=-23
5. -14=10-6x
6x=10+14
6x=24
x=4
6. 2x-2=x+12
2x-x=12+2
x=14
7. 3x-31=2
3x=2+31
3x=33
x=11
8. 5x-14=16
5x=16+14
5x=30
x=6
9. 2x+8=4(5-x)
2x+8=20-4x
2x+4x=20-8
6x=12
x=2
10. 2x-3=3(1+x)
2x-3=3+3x
2x-3x=3+3
-x=6
Let h = the number of half dollars in the jar
and q = the number of quarters
h + q = 30
0.5h + 0.25q = 8.75
multiply the second equation by -2 to get
-h - 0.5q = -17.5
Now add the new equation and the first to eliminate h
h + q = 30
-h - 0.5q = -17.5
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0.5q = 12.5
q = 25
There are 25 quarters, so there must be 5 half dollars
