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math help please??
i need help on the STEPS to figuring these out. please help me! thanks
7: Devan made $20,600 last year. After a raise, she now makes $21,424. What percent was her raise?
4%
5%
7%
8: If the second side of a right triangle measures 2 more than twice the first, the third side measures 3 times the first, and the perimeter is 38, what is the measurement of the first side of the triangle?
5
6
8
9: One cake is cut into pieces to give to neighbors. The families are of different sizes, so mom does not cut the cake evenly; she wants to make sure each family has enough. The second piece is twice the first. The third piece is twice the first. The fourth piece is twice the second. How big was the first piece?
When setting up this equaiton, remember that all of these pieces together equal 1 cake.
1/8 of the cake
1/9 of the cake
1/10 of the cake
10: If Ethan invested $650 in an account earning 3% annualy, how much interest will he earn after one year?
$19.50
$21,666.67
$4.61
8 Answers
- Anonymous1 decade agoFavorite Answer
so many question, well I can try few of them 4 you
7) (21424-20600)/20600*100=4%
8) let the length of first side be x
x+(2x+2)+3x=38
x=6
9) let the first piece be x
sec. piece=2x
third piece=2x
fourth piece=2(2x)
x+2x+2x+4x=1
x=1/9
10) 3/100*650=$19.5
- alphaLv 71 decade ago
1 Amount of increase=$21.424-$20.600
=$824
Therefore percentage of increase
=824*100/20,600
=4%
8) let the length of the first side of the triangle be x
So,the second side is 2x+2 and the third side is 3x
therefore,
x+2x+2+3x=38
or,6x+2=38
or,6x=38-2=36
or,x=36/6=6
Therefore the length of th e first side is 6 units
9) let the first piece be 1/x
hence the second and third pieces are 2/x each and the fourth piece is4/x
Therefore,
1/x+2/x+2/x+4/x=1
or,1+2+2+4=x [multiplying all by x]
or,x=9
therefore,the first piee was 1/9 th part of the cake
10) Principal=$650
rate=3%=0.03
time=1 year
Therefore Interest=650*0.03*1
=$19.50
- ZeroLv 41 decade ago
7. 20,600/21,424=96%
100%- 96%= 4%
4% is the answer
8. i don't know
9. Answer: 1/9 of the cake
twice means 2
Second piece:2
Third piece: 2
Fourth piece: 4
add them up=8+1(the first piece)=9
10. I=PRT(Interest= Principle x Rate x Time)
multiply all the numbers you were given
Answer= $19.50
Source(s): my math class - 1 decade ago
7. 21,424 / 20,600 = 1.04 = a 4% increase
8. Let X equal the measurement of the first side.
Therefore, 2X +2 equals the length of the second side.
3X is the length of the third side.
x + (2x+2) + 3x = 38
6x=36
x=6
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- 1 decade ago
7. 20,600+20,600X(x being the percentage of the salary being added)=21,424
8. side one is X, side two is 2 + 2X, side three is 3X, add all the sides up and set the sum equal to 38
9. Same as number eight; side one is x, side two is 2X, side three is 2X, side four is 4X, add all up and set equal to 1(because you have one cake). Your answer will be a fraction of the cake.
10. 650 * .03= answer
I hope this will help you begin (if you want the answers just ask)
- 1 decade ago
7. (21424 - 20600)/20600=.04 which is 4%
9. 1= a +2a+2a+ 2(2a) = 5a + 4a= 9a
a=1/9
