Algebra help, Will medal!!!

Question

nethercreep333 · Answer

the question?

allieeslabae · Answer

attachment

allieeslabae · Answer

There are 3 if you dont mind. Im stuck, I tried them all, I jsut dont get it.

nethercreep333 · Answer

what grade is this

nethercreep333 · Answer

ive been doing college work all day and then i tel the college student im in 7th grade

nethercreep333 · Answer

but i dont understand this im sorry

allieeslabae · Answer

Can anyone else help?

nethercreep333 · Answer

@the_ocean_girl

campbell_st · Answer

for the 1st question set s(t) = 50 

so you have the equation $$50 = -16t^2 +70t + 3$$

now rewrite the equation as 

$$16t^2 - 70t + 47 = 0$$

solve for t using the general quadratic formula... 

hope that helps

allieeslabae · Answer

Yeah I got that far... I just tried plugging it in and it didnt come out right.

campbell_st · Answer

the 2nd question.... 

if you let the ratio be x:7x     which is in the ratio 1:7


then the area is   $$A = x \times 7x~~~or~~~A = 7x^2$$

you know the area so 

$$2720 = 7x^2$$

solve for x and only use the positive answer... 

so x would be the width, multiply it by 7 to get the length. 

hope that helps

campbell_st · Answer

last question 

find the factors of 24 that add to -10... both factors are negative

allieeslabae · Answer

Hey for the first one is this right? t≈3.5467852,0.8282148

allieeslabae · Answer

@campbell_st

campbell_st · Answer

that's what I got...

campbell_st · Answer

and remember there are 2 answers as the object is travelling in a parabolic arc

$$\frac{70 \pm \sqrt{(-70)^2 - 4 \times 16 \times 47}}{2 \times 16}$$

allieeslabae · Answer

Okay for problem two Im stuck. @campbell_st

allieeslabae · Answer

Would I say 19.71 times 7??? Because I got x as 19.71

campbell_st · Answer

go back and read the post about it... its quite clear

campbell_st · Answer

ok... question 2 I mis-read... 

the raatio is 1.7 to 1

so let 1 side b3 a, the other side is 1.7a

the area is   A = 1.7a x a 

so $$A = 1.7x^2$$

now solve

allieeslabae · Answer

Is it D?

campbell_st · Answer

well solve the equation$$2720 = 1.7x^2$$

allieeslabae · Answer

Okay i got 40

campbell_st · Answer

so now multiply that by 1.7 to get the other measurement

allieeslabae · Answer

Yep It was D 40,68

campbell_st · Answer

correct

allieeslabae · Answer

Okay fro teh last one is it D? @campbell_st

campbell_st · Answer

the last question doesn't have answer choices... 

so tell me what you choice is, in numbers

allieeslabae · Answer

attachment

campbell_st · Answer

you're correct with d