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2 years ago

In A Quiz Team a Scores -30 , 10 , 40 .

Mathematics

1 answer:

VLD [36.1K]2 years ago

3 0

Answer:

Team B scored more. By 10.

(Team A) -30 + 10 = -20 + 40 = 20

(Team B) 30 + 10 = 40 + -10 = 30

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Kaylee decided to donate 30% of her savings if she has $238 in her savings account about how much will she Donate

balu736 [363]

Answer: Donate $71.40

Step-by-step explanation:

To calculate a percentage of an amount, we have to multiply that percentage by the amount and divide by 100.

Donate = $238 · 30 ÷ 100 = $7,140 ÷ 100 = $71.40

Answer : Donate $71.40

$\textit{\textbf{Spymore}}$

3 0

2 years ago

A conical tank is 8 meters high. The radius of the top is 2 meters. At what rate is the water running out if the depth is 3 mete

lina2011 [118]

Answer:

DV/dt = 0,2355 m³/min

Step-by-step explanation:

Conical tank volume V = 1/3 *π*r²*h

r radius at the top 2 meters

when depth of water is 3 meters the radius of the level of water is:

let α angle of vertex of cone then

tan∠α = 2/8 tan∠α = 1/4 tan∠α = 0,25

At the same time when water is at 3 meters depth radius is

tan∠α = r/3 0,25*3= r r = 0,75 m

Now

DV/dt = (1/3)*π*r²*Dh/dt

Dh/dt = 0,4 meters/min

By substitution

DV/dt = 0,2355 m³/min

3 0

2 years ago

0.810x0.00084/0.000400x0.0270leave the answer in a standard form

olga2289 [7]

Answer:

4.5927 x 10^-2 ?

Step-by-step explanation:

6 0

2 years ago

A pot is being used to boil off 1 kg of water. The specific energy required to cause the phase change is 2297 kJ/kg. Assuming th

lana66690 [7]

Answer:

It will take 58 seconds

Step-by-step explanation:

If you have 1 kg of water in the jar, half of it will be 0.5 kg.

To vaporize half of the water (0.500 kg) the energy supply needed is

$2297 kJ/kg*0.5kg=1148.5 kJ$

If the stove is supplying 20 kJ/s, the time its needed is

$\frac{1148.5 kJ}{20\frac{KJ}{s} }=57.425 s$

It will last at least 58 seconds to vaporize half of the water.

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2 years ago

Expand and combine like terms. (4b^2+ 3) (4b^2- 3) = 1 SEE ANSWER

krok68 [10]

Answer:

Step-by-step explanation:

(4b^2+3)(4b^2-3)

since it is the expanded form of formula a^2-b^2=(a+b)(a-b) we can write,

=(4b^2)^2-(3)^3

=16b^4-9

8 0

2 years ago