Step-by-step explanation:
step 1. let l be the length of the rectangle
step 2. l = 2x + 4
step 3. lx = 390 yd^2
step 4. (2x + 4)x = 390
step 5. 2x^2 +4x = 390
step 6. 2x^2 + 4x - 390 = 0
step 7. -4 +- sqr(4^2 -4(2)(-390))/2(2) quadratic formula
step 8. (-4 +- sqr(3136))/4
step 9. (-4 +- 56)/4
step 10. x = 13yd, l = 2x + 4 = 2(13) + 4 = 30yd.
Answer:
1. m = 45
2. x = -18
3. x = -13
4. x = 11
5. x = 19
6. v = 3
7. n = 208
8. b = -1
Step-by-step explanation:
You have to divide 4 by 8 which = .5 and then u put the whole # before the decimal which will equal 4.5 , therefore knowing that 5 divided by 8 =0.625 does not help u write the decimal for 4 4/8 but the decimal for 4 4/8 is 4.5
Answer:
The simplified answer is 7w - 12.
Step-by-step explanation:
-1(w+4) + 2(4w-4)
(-w -4) + (8w - 8)
7w - 12
60% of 40 is 24 and 40-24= 16 so she got 16 wrong
