Answer:
0.3209
in case you dont know A z-score tells you if the distribution it comes from is normal.
Step-by-step explanation:
I think the answer is true
Here you go, hope it's right. The top one is the equation and the bottom one is the work to get the answer.
What is the formula for the area of a triangle? A = 1/2 bh, right? If we let b = the length of the base, then the height is b + 7, seven feet greater than the base. Put in the info we have. A = 1/2 bh 15 = 1/2 b(b+7) 30 = b2 + 7b 0 = b2 + 7b - 30 Since we can't factor the equation, it's time to pull out the old quadratic formula. x = -b + √(b2 - 4ac) / 2a = -7 + √49 - 4(1)(-30) / 2 = = -7 + √169 / 2 -7 +13 / 2 = 3 -7 - 13 / 2 = -10 We can't have a negative length, so our base is 3. This makes the height 10. Let's check. 1/2(3)(10) = 15. Good to go!
