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3 years ago

I need help on this question this is really really hard.

Mathematics

2 answers:

sertanlavr [38]3 years ago

8 0

Yup that persons right take ot from me...i have no clie what was going on so ya its C 4/5

sp2606 [1]3 years ago

7 0

Passed/total=84/105=4/5=C

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The temperature inside a certain industrial machine at time t seconds after startup, for 0 < t < 10, is given by h(t) = 42

frutty [35]

Answer:

$t= \frac{125}{38} s$

Step-by-step explanation:

We are given the temperature inside the machine from startup until 10 seconds later, the formula is:

$h(t)= 42 \cdot t +1 - 4\cdot t +2 (degrees \, C)$

We want to know at what time t the temperature inside the machine will be equal to 128 °C.

So we set:

$h(t)=128$

$42\cdot t+1-4\cdot t+2=128$

Now, we rearrange the equation to keep terms with t on the left hand side and terms without t on the right hand side

$42\cdot t-4\cdot t=128-1-2$

and we simplify:

$(42-4)\cdot t= 128-2-1= 125$

$38 \cdot t = 125$

now it's easy to solve for t:

$t=\frac{125}{38}$

And thus we arrive to the solution.

5 0

2 years ago

( 144 + 6 x 8 ) ÷ 3 = g

UNO [17]

<span>( 144 + 6 x 8 ) ÷ 3 = g
(144 + 48) </span>÷ 3 = g
192 ÷ 3 = g
64 = g or g = 64

4 0

2 years ago

Pls help find area and perimeter for #1 I have limited time I put out another one but forgot to change the points so 65 points a

Anon25 [30]

Answer:

The first one perimeter is 111

Step-by-step explanation:

How to find the perimeter is too add all the numbers you see

4 0

2 years ago

Raymond built a “rocket" made from a cylinder and a cone. He filled the rocket

lianna [129]

Answer:

Rocket can hold maximum 4.5 gallons of water.

Step-by-step explanation:

Volume of the rocket = Volume of the cone on the top + Volume of the cylinder at the bottom

Volume of the cone = $\frac{1}{3}\pi r^{2}h$

Here r = radius of the circular base

h = height of the cone

Volume = $\frac{1}{3}\pi (4)^{2}(14)$

= $\frac{224\pi }{3}$ cubic inch

Volume of the cylinder = $\pi r^{2}h$

Here r = radius of the base

h = height of the cylinder

Volume = $\pi (4)^{2}(16)$

= 256π cubic inches

Volume of the rocket = $\frac{224\pi }{3}+256\pi$

= $\frac{992\pi }{3}$

= 1038.82 cubic inches

Since 231 cubic inches volume of a rocket can hold water = 1 gallon

Therefore, 1038.82 cubic inches space can hold water

= $\frac{1038.82}{231}$

= 4.497

≈ 4.5 gallons

Rocket can hold 4.5 gallons of water.

7 0

2 years ago

Solve the equation for m: 2m + 1 = -3m - 1

Ierofanga [76]

Answer:

m = $\frac{-2}{5}$

Step-by-step explanation:

2m + 1 = -3m - 1 (Given)

2m + 1 + 1 = -3m - 1 + 1 (Addition Property of Equality)

2m + 2 = -3m (Simplify)

2m - 2m + 2 = -3m - 2m (Subtraction Property of Equality)

2 = -5m (Simplify)

$\frac{2}{-5} = \frac{-5m}{-5}$ (Division Property of Equality)

$\frac{-2}{5}$ = m (Simplify)

m = $\frac{-2}{5}$ (Symmetric Property of Equality)

8 0

3 years ago