Aim: How do we review for Test # 7?
Test # 7 tomorrow.
Homework: Complete test review practice sheets.
Answers submitted by several students are posted as comments to this post. Click on comment button below. Check different posted answers for consistency.
posted by Mr.Napoli @ 12:00 PM
2 Comments:
Answers To Test Review #7
1a. 15%of 125 is 18.75
15/100=x/125 cross multiply and you get 18.75
1b. what % of 30 is 20?
x/100= 20/30
cross multiply and you get 66.66%
1c. 15 is what % of 35
x/100=15/35
cross multiply and you get 42.85
2. 75-60/60*100= 25%. that is how you do percent change
3. 1:128 is the scale. times 128 by 8 and then you divide it by 12 and get 85.3 feet
4. 4:24 how many cups do you need for 60 cookies? 60/24 = 2.5 so then you need 2.5 times more cups of flour. so you need 10 cups
5a. 3/5=18/x cross multiply and you get 3x= 90 divide by 3 and x=30
b. cross multiply 5/15=x/x+8 and you get 5x+40=15x subtract 5x from both and you get 40=10x divide by 10 x=4
6.2r/s=x/3s cross multiply and you get 6rs=sx divide by s and you get 6r=x
7.NONE!!
8. 2/5(5x+25)make the fraction a decimal = .4(5x+25)
distrubute the .4 and you get 2x+10
9. x/100= 200/3400 cross multiply and you get
20000=3400x divide by 3400 and you get x= 5.88
10. I divided 312 by 4 and i got 78. Then you divide 1200 by 78 and you get 15.4 years
11.) 10.04-.90=9.14 divide by 10.04= .9103*100 =91.03%
12)Perimeter= 34
area=70
13)multiply 10*6=60 that is the area of the figure
area 60
14)the area of the triangle 30, make a rectangle get the area of it then you divide in 1/2 and get 30
15) GRAPH
16)Slope of C= 0, D=0 E= Undefind
17)x=18
Test #7
1. Find 15% OF 125
15 = X 100X=1825
100 125 X= 18.25
b.THAT %OF 30 IS 20
X = 20 30X=2000
100 30 X=66.6%
C.15 IS WHAT % OF 35
X = 15 1500=35X
100 35 X= 42.8%
2. THE TEMPERATURE INCREASED FROM 60 DEGREES F TO 75 DEGREES F. FIND %INCREASE.
ANS. 75-60=15 15 =.25 .25*100=25
60
3. A SCALE MODEL OF A FIRE TRUCK IS 8"LONG. THE SCALE IS 1:128. WHAT IS THE ACTUAL SIZE OF THE TRUCK IN FEET?
ANS. 128*8= 1024 = 85.3 FEET
25
4.FOUR CUPS OF MELTED CHOCOLATE AND FLOUR MIX MAKES 24 COOKIES. HOW MANY CUPS OF MIX WILL MAKE 60 COOKIES.
ANS. X = 4 24X=240
60 24 X=10
5. FIND X
A} 3:5 = 18:X
3X=90 X=30
b} 5 = X 5X+40=15X
15 X+8 -5X -5X
40=10X X=4
6. SOLVE FOR X IN TERMS OF THE OTHER VARIABLES.
2R:S = X:3S
6RS=SX X=6RS
S S S
7. WHICH RATIOS FORM A PROPORTION
ANS. NONE
8.SIMPLIFY
ANS. 2 (5X+25) 10X+50 2X+10
5 5
9. A WRITER EARNS $3400 A MONTH. LAST MONTH SHE SPENT $200 ON FOOD.WHAT % OF HER INCOME WAS SPENT ON FOOD?
AND. X = 200 3400X=20000
100 3400 X=5.88%
10.THE SIMPLE INTEREST FORMULA IS I=PRT SUPPOSE YOU INVESTED $1200 FOR FOUR YEARS. YOU EARNED $312 IN SIMPLE INTEREST. WHAT IS THE INTEREST RATE?
ANS.
11. IF A QUART OF MILK COST $10.04 IN 1940, AND IN 1990 COST $0.90. WHAT IS THE PERCENT OF CHANGE?
ANS. 10.04-0.90= 9.14= 0.91*100=91%
10.04
12. GRAPH AND FIND THE PERIMETER AND AREA OF THE FIGURE FORMED BY JOINING. A.(4,5)B.(-3,5)C.(-3,-5)D.(4.-5)
ANS. THE PERIMETER IS 10+7+10+7=34
10*7=70
13. FIND THE AREA OF THE FIGURE BELOW
ANS. L=9*W=6= 54
14. FIND THE AREA OF THE FIGURE BELOW
L=6*W=10=60
15.GRAPH THE LINE OF THE EQUATION Y-3X=7
X Y-3X=7 Y
-1 Y-3(-1)=7 4
-2 Y-3(-2)=7 1
-3 Y-3(-3)=7 -2
16. WHAT IS THE Y INTERC-EPT AND SENSE OF LINES A,B,& C
A=(O,3)B=(O,-2)C=(O,-4)
WHAT IS THE EQATION, & SLIDE OF LINES C, B,& A
ANS. C=-4,B=-2, A=3
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