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wariber [46]
3 years ago
9

Solve 3x^2-x=10 A:x=2 and x=-15 B:x=-5 and x=2/3 C:x=-5/3 and x=2 D:x=-3 and x=10

Mathematics
1 answer:
ValentinkaMS [17]3 years ago
8 0

Answer:

C

Step-by-step explanation:

∆=b^2-4a*c=1-4*3*(-10)=121>0 có 2x

x1=-b+sprt∆/2a=1+sprt121/2*3=2

x2=-b-sprt∆/2a=1-sprt121/2*3=-5/3

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Andrew lives at an altitude of 135 feet, and his friend Lisa lives at an altitude of -10 feet. blank residence is higher than bl
tatiyna

Answer:

Andrews residence is higher than Lisa's residence

Step-by-step explanation:


6 0
4 years ago
Read 2 more answers
Which one is the right one? Help me please.
frez [133]

Answer:

90 km/h

Step-by-step explanation:

To solve this problem you first need to convert minutes to hours since the unit is km/h. Doing this we get half an hour (1 hour=60 mins so you divide 30 by 60) after converting you simply divide 45 by 1/2 or .5 to get the answer.

4 0
3 years ago
NEED HELP ASAP!
Brrunno [24]
complette the square to get vertex form or y=a(x-h)^2+k
(h,k) is vertex
1. group x terms, so for y=ax^2+bx+c, do y=(ax^2+bx)+c <span> <span> </span> 2, factor out the leading coefinet (constant in front of the x^2 term), basicallly factor out a </span><span> <span> </span> 3. take 1/2 of the linear coefient (number in front of the x), and square it ,then add negative and positive of it inside parnthases </span><span> <span> </span> 4. complete the squre and expand </span>


so
y=-1/4x^2+4x-19
group
y=(-1/4x^2+4x)-19
undistribute -1/4
y=-1/4(x^2-16x)-19
take 1/2 of -16 and squer it to get 64 then add neg and pos inside
y=-1/4(x^2-16x+64-64)-19
factorperfect square
y=-1/4((x-8)^2-64)-19
expand
y=-1/4(x-8)^2+16-19
y=-1/4(x-8)^2-3
vertex is (8,-3)
8 0
4 years ago
Please what’s the answer?… I really need help
AfilCa [17]

\sqrt[3]{x + 1}  = 2

Let us cube both sides.

=  >  (\sqrt[3]{x + 1} ) ^{3}  =  {2}^{3}

Now, it will be only x + 1.

=  > x + 1 = 8

Transpose 1 to the Right Hand Side.

=  > x = 8 - 1

Now, subtract.

=  > x = 7

<u>Answer</u><u>:</u>

x = 7

Hope you could understand.

If you have any query, feel free to ask.

3 0
2 years ago
A new furnace for your small factory will cost $29,000 and a year to install, will require ongoing maintenance expenditures of $
Neporo4naja [7]

Answer:

Net present value is $61,058.

Step-by-step explanation:

Net present value is the difference between present value of cash inflows and the present value cash outflows over the period of time. NPV method is used in capital budgeting to analyze profitability of the project.

Less: initial cost is $29,000

Add: Year 1: Cost saving due to new furnace is $5,600 (2,800 oil gallons * $ 2 per gallon)

Year 2: Cost saving due to new furnace is $7,000 (2,800 oil gallons * $ 2.50 per gallon)

Year 3- 20: Cost saving due to new furnace is $8,400 (2,800 oil gallons * $ 3 per gallon)

Less : Maintenance expenditure is $1,200

The furnace will benefit for 20 years and the price per gallon will increase by $0.50 year.

The annuity factor is applied at discount factor of 6% and then present value of each cash inflow and outflow is calculated. The net present value is $61,058.

8 0
3 years ago
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