Solve each of the problems, expressing each answer to the proper significant figures
(e.g. 5.34 x 0.89 = 4.8 ). Use exponential notation for problems (d) and (e).

(a) 12.62 + 1.5 + 0.25 =
(b) 0.4278 ÷ 59.6 =

(c) (452) (62) =
14.3

(d) (2.25 x 103) (4.80 x 104) =


(e) (1.64 x 10-4) ÷ (1.2 x 102) =

The answer is in the image 

The total nom of  code that can be used is equal to 5+3 = 8

The solution is in the following image

F=ma

where F=force

m=mass

a=acceleration

Here,

F=4300

a=3.3m/s2

m=F/a

    =4300/3.3

    =1303.03kg

F=ma

where F=force

m=mass

a=acceleration

Here,

F=4300

a=3.3m/s2

m=F/a

    =4300/3.3

    =1303.03kg

Approximately it is aqual to 1300kg

The solution is given in the image below

Speed=Distance/time

Here,

distance=15m

time=1sec

speed=15/1=15m/sec

Distance=Speed*time

time=15min=15*60sec=900sec

Distance travelled in 15 min=15*900=13,500m

=13500/1000 km=13.5Km

The wood before starting =12 feet

Left wood=6 feet

Wood used till now=12-6=6 feet

Picture frame built till now= 6/(3/4)

=8 pieces

Therefore, till now 8 pieces have been made.

30% of 420 are first year students

first year students = (30/100 )*420

=126 students

Student who are not in first year = 420-126

=294 students