Question

1)2(х+7)+4х при х =5 2)9(3-у)+15 при у =2 3)1,5(у+9)+3,5 при х =4 4)3/4(х-6)+2 при х = 8

Answer 1

2(5+7)+4*5=44
1)5+7=12
2)2*12=24
3)4*5=20
4)24+20=44

9(3-2)+15=24
1)3-2=1
2)9*1=9
3)9+15=24

1,5(4+9)+3,5=68,5
1)4+9=13
2)5*13=65
3)65+3,5=68,5

3:4(8-6)+2=3,5
1)8-6=2
2)3:4=0,75
3)0,75*2=1,5
4)1,5+2=3,5

Answer 2

To evaluate the given expressions for specific values of the variables, simply substitute the given values for the variables and then perform the calculations. Let's go through each expression:

1. 2(x + 7) + 4x when x = 5: Substitute x with 5: 2(5 + 7) + 4(5)

Now, calculate: 2(12) + 20 24 + 20 44

So, when x = 5, the expression evaluates to 44.

2. 9(3 - y) + 15 when y = 2: Substitute y with 2: 9(3 - 2) + 15

Now, calculate: 9(1) + 15 9 + 15 24

So, when y = 2, the expression evaluates to 24.

3. 1.5(y + 9) + 3.5 when x = 4: Substitute y with 4: 1.5(4 + 9) + 3.5

Now, calculate: 1.5(13) + 3.5 19.5 + 3.5 23

So, when y = 4, the expression evaluates to 23.

4. (3/4)(x - 6) + 2 when x = 8: Substitute x with 8: (3/4)(8 - 6) + 2

Now, calculate: (3/4)(2) + 2 6/4 + 2 1.5 + 2 3.5

So, when x = 8, the expression evaluates to 3.5.