Answer:
1) 20.
2) 30.
3) 47.
4) 86.
5) 27.
Step-by-step explanation:
The order of operations consist in, first, evaluate the parenthesis, then the exponents, the multiplication, the division, and as last the addition and subtraction. Having this in mind:
1) (28 ÷ 4) + 3 + (10 - 8) × 5
7 + 3 + 2 × 5
7 + 3 + 10
20
2) 12 - 5 + 6 × 3 + 20 ÷ 4
12 - 5 + 18 + 5
30
3) 36 ÷ 9 + 48 - 10 ÷ 2
4 + 48 - 5
47
4) 10 + 8 × 90 ÷ 9 - 4
10 + 80 - 4
86
5) 8 × 3 + 70 ÷ 7 – 7
24 + 10 - 7
27
One hundred twelve thousand, three hundred
note: there is NO "and" anywhere in here. You only use "and" when it comes to the decimal part
Answer: |5-2.5|=5
Step-by-step explanation:
Step-by-step explanation:
Here, The work of a student to solve the equation :

The steps for calculating the value of x are :
Step 1: 4(2x − 4) = 8 + 2x + 8
Step 2: 6x − 8 = 16 + 2x
Step 3: 6x − 2x = 16 + 8
Step 4: 4x = 24
Step 5: x = 6
Step 2 is incorrect, as the student instead of multiplying, adds the number as :
4(2x − 4) = 8 + 2x + 8
Here, the correct step is :
8x − 16 = 16 + 2x
6 x = 32
x = 5.33
So, the error is in STEP 2 and the correct option is (b).
Answer:
Step-by-step explanation:
(5*x)(6-3x)=5x(6-3x) simplified
=30x-15x^2