Plz i’m confused can someone with one ,three and 4 oh and 2 i’ll give you 22 points plz fast you plz plz explain for 1 plz

1. 783*23=18009, so it is 18009miles^2

2. Triangle

3. B is your variable

4. -60

answer:

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21  

-7 + ? = 21

-7 + 28 = 21

hope it

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.