4.0 x 10
3
kJ/mol
How many significant digits are there

2

Step-by-step explanation:

4.0 has 2 significant digits.

The zeros after a non zero number are significant.

Any non zero number is significant.

0.004 has 1 significant digit.

4000 has 4 significant digits.

In your case 4.0 × 10^3 there is an exception because it is in scientific notation. So there are 2 significant digits.

hope this makes sense.

:)

answer: the two figures are congruent.

step-by-step explanation: they're congruent because figure efgh is reflected across the x and y axis but it was also rotated.

hope it !

option 2 is correct.

step-by-step explanation:

we are given two inequality equation

x+y> 5 and -3x+2y< -2

first we draw the graph of both function using t-table method

equation: x+y> 5

for x=0, y=5

for x=-5, y=0

table:

x   :   0     5

y   :   5     0

test point (0,0) , 0> 5

false

equation: -3x+2y< -2

for x=0, y=-1

for x=2, y=4

table:

x   :   0     2

y   : -1       4

test point (0,0) , 0< -2

true

now we draw the graph. see the attachment for graph.

common region would be solution set.

option 2 is correct.