Evaluate 5k/(9-7) k=6?

Question

(2) Evaluate (2X) (5x)-23, where x=4.
(3)3p+(2-p), where p=3
(4)If x= -1,y=5 and z=2, find the value 3xy-2

Answer 1

1. Evaluate: 5k/(9-7) when k = 6

First: replace "6" with the k-variable....

[5(6)]/(9-7)

Sec: use PEMDAS > (), exponents, multiplication, division, addition & subtraction...

30/2
= 15

2. Evaluate: (2x)(5x) - 23 when x = 4

First: replace "4" with the x-variable...
(2*4)(5*4) - 23

(8)(20) - 23
160 - 23
= 137

3. Evaluate: 3p + (2 - p) when p = 3
First: replace "3" with the p-variable...
3(3) + (2 - 3)

9 + (-1)
9 - 1
= 8

4. When x = -1; y = 5 and z = 2, find the value of 3xy-2
First: replace "-1" with the x-variable & "5" with the y-variable...

3(-1)(5) - 2

3(-5) - 2
- 15 - 2
= - 17

Answer 2

i think number two is 137.


my work(something tells me i did not do this right)=]


(2 X 4) (5 X 4)

8 X 20-23

160-23=

137

137

Answer 3

1)15
2)137
3)8
4)-4

Answer 4

this is someones home work! U should be doing it u r self, just plug the values for x,y,z,p, and k into the eqations. Good luck

Answer 5

1.) 15
2.) 137
3.) 8
4.) -17

Answer 6

15
137
8
-17