All categories

2 years ago

Find the exact solution of 5- 2x^2 = -15

1 answer:

6 0

Step 1: Simplify both sides of the equation.
−2x^2 + 5= 15

Step 2 : Subtract 5 from both sides
-2x^2 + 5 - 5 = -15 - 5
-2x^2 = -20

Step 3: Divide both sides by -2.
-2x^2 -20
———- = ———-
-2 -2

X^2 = 10

The answer is :
x=±√
10

You might be interested in

Plz help <br><br> (32^-1/2)^-2/5

Naddik [55]

Answer:

819.2

Step-by-step explanation:

I searched it up on Google sry just needed the points lol

7 0

3 years ago

(Due soon, please hurry!)

Ludmilka [50]

Answer:

I Dont Know

Step-by-step explanation:

8 0

2 years ago

Read 2 more answers

Show some work please or an explanation please. I'll give out brainlest.<br><br> 3x + 5 = -x -7

Viefleur [7K]

Step-by-step explanation:

3x+x=-7-5

4x=-12

x=-12/4

x=-3

7 0

3 years ago

Read 2 more answers

john and jack found a coin on the sidewalk. they argued about whether the coin is fair. john claimed a 40% chance for the coin t

expeople1 [14]

Since it is observed that I z I = 3.464 > 1.96 it is concluded that the null hypothesis is rejected.

Therefore we reject John's claim.

Here:

we can use 1 sample proportion test to check the claim of John

H₀ : p₀ = 0.4

H₁ : p₀ ≠ 0.4

Test statistic is

z = p - p₀/√p₀(1-p₀)n

Let X be the random variable denoting the number of heads.

Now p = X/n

= 8/50

= 0.16

p₀ = 0.4

1-p₀ = 1-0.4

= 0.6

z = -3.464

since it is observed that I z I = 3.464 > 1.96 it is concluded that the null hypothesis is rejected.

Therefore we reject John's claim.

Learn more about Null hypothesis here:

brainly.com/question/15980493

#SPJ4

6 0

1 year ago

A sphere is just enclosed inside a right circular cylinder. If the volume of the sphere is 140 cm3, find the volume of the gap b

alexgriva [62]

-----------------------------------------------------------
Find Radius :
-----------------------------------------------------------
$\text {Volume of a sphere =} \dfrac{4}{3} \pi r^3$

$\dfrac{4}{3} \pi r^3 = 140$

$\pi r^3 = 140 \times \dfrac{3}{4}$

$\pi r^3 = 105$

$r^3 = \dfrac{105}{ \pi}$

$r = 3.22 \ cm$

-----------------------------------------------------------
Find volume of the cylinder :
-----------------------------------------------------------
$\text {Volume of the cylinder = } \pi r^2h$

$\text {Volume of the cylinder = } \pi ((3.22)^2(3.22 \times 2)$

$\text {Volume of the cylinder = } 209.77 \ cm^3$

-----------------------------------------------------------
Find volume of the gap :
-----------------------------------------------------------
$\text {Volume of gap = } 209.77 - 140$

$\text {Volume of gap = } 69.77 \ cm^3$

-----------------------------------------------------------
$\bf \text {Answer : } 69.77 \cm^3$
-----------------------------------------------------------

6 0

3 years ago