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3 years ago

PLZ HELP 20 POINTS

2 answers:

8 0

He has 415 to spend on a trip
25 for gas
415-25=390
He must spend 100 each day
390≤100d
3.9≤d
He cannot have part of a day so he can only spend 3 days
Solution: d=3

Agata [3.3K]3 years ago

6 0

It's 4 just took the test.

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Break the numbers 0-9 into 3 groups. Each group needs to equal the same number when added! Write out the groupsand the sum of ea

Burka [1]

we must do the following:

select the major, the minor and the half and add, like this:

$9+0+5+1=15$

therefore:

$7+6+2=15$

also:

$\begin{gathered} 8+4+3=15 \\ \end{gathered}$

the groups are:

(9,0,1,5); (7,6,2); (8,4,3)

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7 months ago

In a school with 2,000 students, a random sample of 120 students were asked which fruit is their favorite. Their

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2 years ago

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A tank contains 100 gal of brine made by dissolving 80 Ib of salt in water. Pure water runs into the tank at the rate of 4 gal/m

ohaa [14]

Answer:

Step-by-step explanation:

Amount of brine = 100 gal

amount of salt = 80 lb

rate of water running = 4 gal / min

Let A be the amount of salt in lb in the tank at any time t.

(a) dA/dt = rate of salt in - rate of salt out

Rate of salt in = 0

rate of salt out = A x 4 / 100 = A / 25 lb/min

So, dA/dt = 0 - A/25 = - A/25 lb/min

$\frac{dA}{A}=-\frac{1}{25}dt$

$\int \frac{dA}{A}=-\frac{1}{25}\int dt$

$A(t) = C e^{-0.04t}$

When t = 0, A = 80 lb

So,

$A(t) = 80 e^{-0.04t}$

(b) Now, A = 40 lb

So,

$40 = 80 e^{-0.04t}$

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take log on both the sides

$ln 0.5 = - 0.04 t$

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2 years ago

True or false Exterior angles are the angles created when the sides of the triangle are shortened.

Naddika [18.5K]

Answer:

The statement is false. Exterior angles are the angles created when the sides of the triangle are extended

Step-by-step explanation:

In order to find the exterior angle of a polygon, the side of the polygon is extended to go past the vertex of the polygon to form an angle adjacent and supplementary to the the interior angle of the polygon at the vertex of the polygon where the exterior angle is formed.

The sum of the exterior angle and the adjacent interior angle is equal to 180°

The exterior angle can also be described as being formed by one side of a polygon and an extension of the adjacent side to previous side of the same polygon and it can also be referred to as a turning or an external angle.

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3 years ago

Pls help meeee I don’t understand this at alll

balu736 [363]

Answer:

you need the formula for the cone , Korc

Step-by-step explanation:

formula for cone = $\frac{1}{3}$ *π* $r^{2}$ *h