In industry: most scientific discoveries are made useful products are made scientific principles are invented

SAT

1 answer:

Elina [12.6K]3 years ago

4 0

Answer:

Useful products are made

Explanation:

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About how many people had viewed the video once it had been online for 20 days? 190 858 6,271 86,460

aev [14]

About 6,271 people had viewed the video once it had been online for 20 days. The correct option is C.

<h3>What is exponential equation?</h3>

Exponential equation is the equation in which the exponent or part of exponents used as variables.

$fx = 33 \times (1.3)^x$

where, x is the number of days, given that x = 20

Putting the values in the equation

$f\times 20 = 33 \times (1.3)^2^0 = 6,271 \;days$

Thus, the correct option is C, 6,271.

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2 years ago

If a recipe for chocolate chip cookies uses 5 cups of chocolate chips for 3 batches, how many cups of chocolate chips are needed

maxonik [38]

Answer:

5 cups of chocolate chips for 3 batches, then

x cups of chocolate chips for 5 batches.

x/5 = 5/3

=> x = 5 x 5/3 = 25/3 = 8.3

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3 years ago

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Newton’s law of cooling states that for a cooling substance with initial temperature t0, the temperature t(t) after t minutes ca

antoniya [11.8K]

The cooling rate of the substance is approximately 0.0732.

According to the statement, the Newton's law of cooling is defined by the following formula:

$T(t) = T_{s} + (T_{o}-T_{s})\cdot e^{-k\cdot t}$ (1)

Where:

$T_{s}$ - Final temperature, in degrees Celsius.
$T_{o}$ - Initial temperature, in degrees Celsius.
$t$ - Time, in minutes.
$k$ - Cooling rate, in $\frac{1}{min}$ .
$T(t)$ - Current temperature, in degrees Celsius.

Please notice that substance reaches thermal equilibrium when $T(t) = T_{s}$ , that is when temperature of the substance is equal to the temperature of surrounding air.

If we know that $T_{o} = 80\,^{\circ}C$ , $t = 15\,min$ , $T_{s} = 50\,^{\circ}C$ and $T(15) = 60\,^{\circ}C$ , then the cooling rate of the substance is: