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
Marina CMI [18]
3 years ago
9

I need help what is 3-2y+(-8y)+7.8

Mathematics
2 answers:
Snowcat [4.5K]3 years ago
6 0

Answer:

10.8-10y OR -10y+ 10.8

Step-by-step explanation:

sO: 3-2y-8y+7.8

          3-10y+7.8

10.8-10y / -10y+10.8 Either one

Veseljchak [2.6K]3 years ago
6 0
Changes made to your input should not affect the solution:

(1): "7.8" was replaced by "(78/10)".

STEP
1
:

39
Simplify ——
5
Equation at the end of step
1
:

39
(3 - 10y) + ——
5
STEP
2
:
Rewriting the whole as an Equivalent Fraction

2.1 Adding a fraction to a whole

Rewrite the whole as a fraction using 5 as the denominator :

3 - 10y (3 - 10y) • 5
3 - 10y = ——————— = —————————————
1 5
Equivalent fraction : The fraction thus generated looks different but has the same value as the whole

Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator

Adding fractions that have a common denominator :

2.2 Adding up the two equivalent fractions
Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

(3-10y) • 5 + 39 54 - 50y
———————————————— = ————————
5 5
STEP
3
:

Pulling out like terms :

3.1 Pull out like factors :

54 - 50y = -2 • (25y - 27)

Final result :
-2 • (25y - 27)
———————————————
5
You might be interested in
Let f(x) = 2x + 8, g(x) = x² + 2x – 8, and h(x)
klio [65]
The answer is (g-f)(2)
4 0
2 years ago
9. Jack is learning to save, spend, and give his money away to charities. He has determined to give 10% of his summer job earnin
Kamila [148]

Answer:

$2560

Step-by-step explanation:

if 10%=256

then 10 times the amount 100% is 2560

4 0
3 years ago
Please help and explain answer
prohojiy [21]
ABCD is square so AB = BC = CD = AD
10 - x = x - 8 so x= 9 then AD will be 1yd, i guess im not sure bc i dunno the 2x-17 for :((
5 0
3 years ago
TRUE OR FALSE (i really don't know what the right answer is i was hoping anyone else would know)
vaieri [72.5K]
I think the answer is a
8 0
3 years ago
Read 2 more answers
A rock thrown vertically upward from the surface of the moon at a velocity of 36​m/sec reaches a height of s = 36t - 0.8 t^2 met
Verdich [7]

Answer:

a. The rock's velocity is v(t)=36-1.6t \:{(m/s)}  and the acceleration is a(t)=-1.6  \:{(m/s^2)}

b. It takes 22.5 seconds to reach the highest point.

c. The rock goes up to 405 m.

d. It reach half its maximum height when time is 6.59 s or 38.41 s.

e. The rock is aloft for 45 seconds.

Step-by-step explanation:

  • Velocity is defined as the rate of change of position or the rate of displacement. v(t)=\frac{ds}{dt}
  • Acceleration is defined as the rate of change of velocity. a(t)=\frac{dv}{dt}

a.

The rock's velocity is the derivative of the height function s(t) = 36t - 0.8 t^2

v(t)=\frac{d}{dt}(36t - 0.8 t^2) \\\\\mathrm{Apply\:the\:Sum/Difference\:Rule}:\quad \left(f\pm g\right)'=f\:'\pm g'\\\\v(t)=\frac{d}{dt}\left(36t\right)-\frac{d}{dt}\left(0.8t^2\right)\\\\v(t)=36-1.6t

The rock's acceleration is the derivative of the velocity function v(t)=36-1.6t

a(t)=\frac{d}{dt}(36-1.6t)\\\\a(t)=-1.6

b. The rock will reach its highest point when the velocity becomes zero.

v(t)=36-1.6t=0\\36\cdot \:10-1.6t\cdot \:10=0\cdot \:10\\360-16t=0\\360-16t-360=0-360\\-16t=-360\\t=\frac{45}{2}=22.5

It takes 22.5 seconds to reach the highest point.

c. The rock reach its highest point when t = 22.5 s

Thus

s(22.5) = 36(22.5) - 0.8 (22.5)^2\\s(22.5) =405

So the rock goes up to 405 m.

d. The maximum height is 405 m. So the half of its maximum height = \frac{405}{2} =202.5 \:m

To find the time it reach half its maximum height, we need to solve

36t - 0.8 t^2=202.5\\36t\cdot \:10-0.8t^2\cdot \:10=202.5\cdot \:10\\360t-8t^2=2025\\360t-8t^2-2025=2025-2025\\-8t^2+360t-2025=0

For a quadratic equation of the form ax^2+bx+c=0 the solutions are

x_{1,\:2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}

\mathrm{For\:}\quad a=-8,\:b=360,\:c=-2025:\\\\t=\frac{-360+\sqrt{360^2-4\left(-8\right)\left(-2025\right)}}{2\left(-8\right)}=\frac{45\left(2-\sqrt{2}\right)}{4}\approx 6.59\\\\t=\frac{-360-\sqrt{360^2-4\left(-8\right)\left(-2025\right)}}{2\left(-8\right)}=\frac{45\left(2+\sqrt{2}\right)}{4}\approx 38.41

It reach half its maximum height when time is 6.59 s or 38.41 s.

e. It is aloft until s(t) = 0 again

36t - 0.8 t^2=0\\\\\mathrm{Factor\:}36t-0.8t^2\rightarrow -t\left(0.8t-36\right)\\\\\mathrm{The\:solutions\:to\:the\:quadratic\:equation\:are:}\\\\t=0,\:t=45

The rock is aloft for 45 seconds.

5 0
3 years ago
Other questions:
  • Determine the intercepts of the line. 7x-5=4y-6/7x−5=4y−6
    12·2 answers
  • What is the area of a circle with a diameter of 37 inches?
    9·2 answers
  • What is an equation of the line that passes through the points (-3,-5) and<br> (-3,-8)?
    11·2 answers
  • Use a double number line to solve. Gabe collects model train and planes. He has 2 trains for every 5 planes. If Gabe has 25 plan
    14·1 answer
  • The answer to an addition problem is called a ___.\
    6·1 answer
  • A parabola is defined by the equation x2 = y. In which direction will the parabola open?
    15·2 answers
  • Can someone please help me answer my question? I need an explanation as well!!! WILL GIVE BRAINLIEST IF CORRECT!!!
    7·2 answers
  • Write and solve an inequality using the information about Noah.
    6·1 answer
  • MATH HELP ASAP! MARKING BRIANLISTT!! INEQUALITYS
    15·2 answers
  • Five more than a number p is less than 17.
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!