1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Darya [45]
3 years ago
13

One question is all I need help on.

Mathematics
1 answer:
natka813 [3]3 years ago
5 0
Hello,

y=x²+2x
y=3x+20

==>x²+2x=3x+20
==>x²+2x-3x-20=0
==>x²-x-20=0
==>x²-2*1/2*x+1/4-20-1/4=0
==>(x-1/2)²-81/4=0
==>(x-1/2-9/2)(x-1/2+9/2)=0
==>(x-5)(x+4)=0
==>(x=5 and y= 35 ) or (x=-4 and y=-8)


You might be interested in
Logan opened a savings account 21 years ago with a deposit of $3,471.52. The account has an interest rate of 3.1% compounded mon
notka56 [123]
P = $3,471.52, the principal
r = 3.1% = 0.031, annual ratr
n = 12, monthly compounding
t = 21 years

Note that n*t = 252.

The value after 21 years is
A = 3471.52*(1 + 0.031/12)²⁵²
   = $6,650.91

The interest earned is
6650.91 - 3471.52 = 3179.39

Answer: $3,179.39
8 0
3 years ago
Is y=150x proportional?
daser333 [38]

Answer:

yes

Step-by-step explanation:

A proportional equation is of the form

y = kx where k is the constant of proportionality

y = 150x is proportional

5 0
3 years ago
Read 2 more answers
Mr. and mrs.storey drive 3200 miles in all during their vacation. mr.storey drove 3 times as many miles as mrs.storey how many m
vaieri [72.5K]
This can be solve by establishing equations.
let x be the miles mrs. storey drove
y be the miles mr storey drovee
 
the first equation is
y = 3x

second equation
x + y = 3200
then substitute equation 1

x + 3x = 3200
4x = 3200
x = 800 miles mrs storey drove
y = 3x = 2400 miles mr storey drove
5 0
4 years ago
The number of a countrys unemployed workers decreased from 3.2 million to 2.5 million last year. If the country's population rem
Sever21 [200]
More people have grown up or more people have found jobs

Hope this helps....
--------------------------------------------------------------------------------
5 0
3 years ago
Find the surface area of the cylinder give your answer in terms of pi. The radius is 4mm and the height is 5mm
Komok [63]
The surface area of a cylinder is the area of the bases plus the area of the side, or SA = 2*A₁ + A₂

Since the area of a circle is \pi r^{2},
SA = 2*(\pi r^{2}) + A₂

Since the area of the side is height * the circumference of the circle or A₂ = h * 2 \pi r, then SA must be;

SA = 2* \pi (r ^{2} )+h*2 \pi r
SA = 2* \pi (4 ^{2} )+5*2 \pi (4)
SA = 32* \pi+80 \pi
SA ≈ <span>351.858377202</span>
3 0
3 years ago
Other questions:
  • a coast redwood tree is about 10 times as tall as an apple tree one of the tallest coast redwood even measured was 254 feet fall
    7·1 answer
  • Which is the equation of a line that has a slope of One-half and passes through point (2, –3)?
    15·2 answers
  • Where is the red dot located?
    5·2 answers
  • Solve the equation and explain​
    9·1 answer
  • PLEASE HELP!!!! ASAP *grade 9 work*
    7·2 answers
  • Evaluate log3 1 over 81<br><br> 27<br><br> 4<br><br> −27<br><br> −4
    6·1 answer
  • PLEASE HELP WILL GIVE BRAINLIST.<br> What is the slope of the line in the graph?
    9·1 answer
  • Find the product. (y^2)^5 · y 8
    5·2 answers
  • Find each difference 1 1/2 + (-1/2)
    11·1 answer
  • Need helppp ASAP!!!!!
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!