The GALEX observatory was a recent observatory, that was launched to observe over a half-billion galaxies going back to when our
Universe was just about 3 billion years old. It used wavelengths of higher energy than visible light. Which of these could describe the
wavelengths used by the GALEX observatory to make observations in space?
A)microwaves
B)radio waves
C)infrared waves
D)ultraviolet Waves

Ultraviolet waves trust me

Step-by-step explanation:

341

step-by-step explanation:

all you have to do is 9x31 (which equals 279) and then 20x31 (which equals 620). then you have to subtract. 620-279=341.

answer: - (a)

(b) 88 seats

step-by-step explanation:

given: in an auditorium, there are 22 seats in the first row and 28 seats in the second row.

thus first term=

second term=

the number of seats in a row continues to increase by 6 with each additional row.

⇒d= 6

a) given formula :

b)   let the number of seats (n) = 12

substitute n=12 in the explicit rule formed in (a)

∴there are 88 seats in 12 rows.