I think it is me !!!!!!!$$$$$$$!$
Answer:
its either got to be c or b but id go with the one that you thank it is
Step-by-step explanation:
Answer:
14.45*10^6
Step-by-step explanation:
(1.7*10^4)*(8.5*10^2)=14.45*10^6
8²+9(12÷3×2)-7
well we are going to start in the parentheses and do order of operations
so 12÷3=4
then 4×2=8
so you have 8² +9(8)-7
well we still need to get rid of the parentheses 9×8=72
so then we are left with 8²=72-7
so now we have to get rid of the exponents so8²=64
64+72-7
136-7=129
so 129 is your answer to the first one.
the second one is easy. its a single step equation.
you are trying to get x by itself. so you have 7x=42. you want to get rid of the seven so you have to do the opposite of what it is doing to x. the 7 is multiplying by the x. So whats the opposite of multiplication... division. so you have to divide both sides by 7. so you have 7÷7x=42÷7
now simplify and you have x=6
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!
