Answers to M$A
Exam # 1
|
|
”20” |
“25” |
“30” |
|
1 |
$5.75·(4+5) =
$51.75 |
$5.75·(6+5) = $63.25 |
$5.75·(4+6) = $57.50 |
|
2 |
20·34 =
680 |
25·34 =
850 |
30·34 =
1020 |
|
3 |
x: Blackie,
Shady 30 + 2x ------- 3 |
x: Blackie,
Shady 40 + 2x -------
3 |
x: Blackie, Shady 50 + 2x -------
3 |
|
4 |
25x |
30x |
30x |
|
5 |
4th grade: x 80+90+75+x 245+x --------- =
----- 4 4 |
4th grade: x 80+70+75+x 225+x ----------- =
----- 4 4 |
4th grade: x 80+70+85+x 235+x ----------- =
------ 4 4 |
|
6 |
8(2x-3) = 16x -
24 |
8(2x+3) = 16x + 24 |
8(2x+5) = 16x +
40 |
|
7 |
$4x |
$5x |
$6x |
|
8 |
x+1,x+2,x+3 |
X+1,x+2,x+3 |
x+1,x+2,x+3 |
|
9 |
3(x+7) = 3x+21 |
3(x+5) = 3x+15 |
3(x+5) = 3x+15 |
|
10 |
$10(x+y) |
$12(x+y) |
$8(x+y) |
|
11 |
4·4x = 16x |
4·3x = 12 x |
4·3x = 12x |
|
12 |
Joan:x Elliott: 4x |
Joan:x Elliott: 3x |
Joan:x Elliott: 5x |
|
13 |
Sally: x Joan: x+5 |
Sally: x Joan: x+3 |
Sally: x Joan: x+4 |
|
14 |
Measure(B): b Measure(A):
b-15 |
Measure(B): b Measure(A):
b-12 |
Measure(B): b Measure(A):
b-14 |
|
15 |
Width: x Length: 8+2x |
Width: x Length: 10+2x |
Width: x Length: 9+2x |
|
16 |
Diana: x Maria: 3x-8 |
Diana: x Maria: 3x-5 |
Diana: x Maria: 3x-10 |
|
17 |
Pete: x Aron: x/2 |
William: x Alan: x/2 |
Joe: x Alan: x/2 |
|
18 |
Left: x Right: x |
Left: x Right: x |
Left: x Right: x |
|
19 |
x: no. of videos cost: $10 + $4x |
x: no. of videos cost: $12 + $3x |
x: no. of videos cost: $12 + $4x |
|
20 |
$10 + $4·7 = $
38 |
$12 + $3·7 = $
33 |
$12 + $4·7 = $
40 |
|
21 |
Rose: x Sam: 4x Together: 5x |
Rose: x Sam: 5x Together: 6x |
Rose: x Sam: 3x Together: 4x |
|
22 |
(5x+3) + 1 =
5x+4 |
(4x+3) + 1 =
4x+4 |
(5x+4) + 1 =
5x+5 |