Can someone help me with math I need help I will attempt to give y’all help too!

Step-by-step explanation:

Area of triangular pyramid = (1/3)*Base Area * height

1) b = 2 in  ; h = 6 in and H = 5.8 in

2) b = 3 mi  ; h = 4 mi  and H = 4 mi

3) b = 4 in ; h = 3 in & H = 11 in

4)b = 8 ft ; h = 15 ft ; H = 19ft

5) base area = 4.5 mm^2 ; H = 4mm

-14

step-by-step explanation:

2x2 – 2(x+4)

=2x2-2（5+4）

=4-2×9

=4-18

=-14