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3 years ago

11

Which expression shows you how you can use mental math to simplify the expression (53 + 23) + 7 most easily? A. 7 + (23 + 53) B.

(23 + 53) + 7 C. 53 + (23 + 7) D. 7 + (53 + 23)

2 answers:

lidiya [134]3 years ago

8 0

Answer:

The answer is C. 53 + (23+7).

Step-by-step explanation:

Ymorist [56]3 years ago

4 0

Answer:

C. 53 + (23 + 7)

Step-by-step explanation:

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3x+8=35 Show your work

ella [17]

Answer:

x=9

Step-by-step explanation:

So first subtract 8 on both Sides

3x+8-8=35-8

3x=27

Now divide 3 on both sides to isolate the variable x

x=9

So x=9

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ExtremeBDS [4]

The answer is 12.6

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Evaluate the expression (a^2+b)^2 - (a^2-b)^2, if a=4 and b=1.

Sergio039 [100]

(a^2+b)^2 - (a^2-b)^2, if a=4 b=1.

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3 years ago

A pot of stew is placed on a stove to heat. The temperature of the liquid reaches 170°F, and then the pot is taken off the burne

belka [17]

Answer:

$T =84.7\°F$

Step-by-step explanation:

Newton's cooling model is:

$T(t) =T_0 + (T_i-T_0)e^{-kt}$

Where

t is the time in hours

$T_0$ is the ambient temperature

$T_i$ is the initial temperature of the body

$k=0.34$

We know that:

$T_0=76\°F$

$T_i=170\°F$

Then after 7 hours the temperature of the liquid will be:

$T(7) =76 + (170-76)e^{-0.34(7)}$

$T =84.7\°F$

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15. Pick the best option to describe vertical angles

ella [17]

C. They are equal to each other I think

6 0

3 years ago