The answer would most defiantly be “21”, choice c “21”
Answer:
1.12 x 
Step-by-step explanation:
To solve, move the decimal back until you are past the 0s. It has to be moved back 4 times to get to the first 1.
1.12
Now, since you went back 4, the exponent of 10 is -4.
- Total time=5h
- Time devoted for mathematics and science=2h
Let Time devoted for others be x



Answer:

Step-by-step explanation:
To solve a formula for one of its variables do that
- Separate it on one side and the other terms on the other side
- Make its coefficient equals 1
Let us use these steps to solve our question
∵ V =
b²h
→ Underline b
∴ V =
<u>b²</u>h
→ Multiply both sides by 3 to cancel the denominator on the right side
∴ 3V = <u>b²</u>h
→ Divide both sides by h to move it to the other side
∴ 
→ To find b take √ for both sides
∴ 
→ The square root will cancel the power 2 of b
∴ 
→ Switch the two sides
∴ 
Answer:The pair of angles must be supplementary are ∠2 and ∠5.
The correct option is (B)
What is supplementary angle?
Two angles are called supplementary when their measures add up to 180 degrees.
Given that:
∠2=90 and ∠5=90
So,
∠2+∠5
=90+90
=180
Hence, angle 2 and 5 makes supplementary angles.