Explain how an estimate you to place the decimal point when multiplying 3.9 * 5.3

3.9 × 5.3 = 20.67

Explanation:

given data

digit 1  =  3.9

digit 2 = 5.3

to find out

multiplying 3.9 * 5.3

solution

we know that 3.9 round about =  4

and 5.3 round about = 5

so 5 × 4  will be = 20

but here when we remove decimal

simple multiply it as

×

here 39 × 53 = 2067

and 10 × 10 = 100

so now we get

×  =  

put here again decimal point

3.9 × 5.3 = 20.67

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

a 2,000 calorie based diet.