Help me or else my 7th grade math teacher will be mad

40

Step-by-step explanation:

Set up a ratio, given that the parallelograms are similar. The sides 12 and 30 correspond to each other, and the sides 16 and PQ correspond to each other as well.

so creating a ratio you get 12 / 30 = 16 / PQ

so PQ = 30 * 16 / 12

PQ = 40

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)