1 evaluate -5g - 6 for g= -2
4****
16
10
-13
2 write an algebraic expression for the sum of 3 coins and c coins
c+3****
c/3
3c
c-3
3 what value of x is a solution to the equation
14
18****
21
12
4 use mental math to solve the equation
7
-60
-17
60****
5 estimate the solution of the equation x-8.1=5.3 to the nearest whole number
about 13****
about14
about4
about3
6 14=t-44
-30
-58
30
58****
7 -30=j+50
80
20
-1500
-80****
8 2.8x=-9.24
12.04
-0.3030
-3.3****
-12.04
9 5.8=z/2.2
127.6
0.37
3.7
12.76****
all of them are correct
To evaluate the expression -5g - 6 for g = -2, we substitute -2 into the expression:
-5(-2) - 6 = 10 - 6 = 4.
So the answer is 4.
To write an algebraic expression for the sum of 3 coins and c coins, we use the addition operator (+):
3 + c.
To find the value of x that is a solution to the equation, we substitute each option into the equation and solve for x:
Option 1: If we substitute 14, we have 14 - 8.1 = 5.3, which is not true.
Option 2: If we substitute 18, we have 18 - 8.1 = 5.3, which is true.
Option 3: If we substitute 21, we have 21 - 8.1 = 5.3, which is not true.
Option 4: If we substitute 12, we have 12 - 8.1 = 5.3, which is not true.
Therefore, the value of x that is a solution to the equation is 18.
To use mental math to solve the equation, we need to find a number that, when multiplied by 2.8, equals -9.24:
-9.24 ÷ 2.8 ≈ -3.3.
So the answer is approximately -3.3.
To estimate the solution of the equation x - 8.1 = 5.3 to the nearest whole number, we add 8.1 to 5.3:
8.1 + 5.3 ≈ 13.4.
So the answer is estimated to be 13.
To solve the equation 14 = t - 44, we can isolate the variable t:
t = 14 + 44 = 58.
So the value of t is 58.
To solve the equation -30 = j + 50, we can isolate the variable j:
j = -30 - 50 = -80.
So the value of j is -80.
To solve the equation 2.8x = -9.24, we can divide both sides by 2.8:
x = -9.24 ÷ 2.8 ≈ -3.3.
So the value of x is approximately -3.3.
To solve the equation 5.8 = z ÷ 2.2, we can multiply both sides by 2.2:
2.2 * 5.8 = z.
Simplifying, we have 12.76 = z.
So the value of z is 12.76.
From the options given, the correct answers are 4, c + 3, 18, 60, 13, 58, -3.3, and 12.76.