All categories

3 years ago

Robin says,"I can find 8×7 by multiplying 3×7 and doubling it". Does her statement make sense. Explain your answer.

Mathematics

2 answers:

Ierofanga [76]3 years ago

7 0

no, because 8x7 is 56 while 2(3x7) is 42 and the equations would not equal each other, therefore robin is wrong.

bonufazy [111]3 years ago

5 0

No her statement does not make sense because 8X7 is 56. (3X7) x2 is 42.

You might be interested in

For the graphed exponential equation, calculate the average rate of change from x = −3 to x = 0.

PolarNik [594]

Answer:

Step-by-step explanation:

f(-3) = 2

f(0) = -5

[f(-3) - f(0)] ÷ -3-0

[2-(-5)] / -3

7/-3

8 0

3 years ago

In a survey, patients are asked how long they sat in their doctor's waiting area. The results for two doctors are shown below.

Marizza181 [45]

Answer: The mean is the best measure. The mean waiting time for doctor #2 is 2.5 minutes longer than for doctor #1

Step-by-step explanation:

4 0

3 years ago

const2013 [10]

Answer:

huh ano ba yan

Step-by-step explanation:

di ko maintindihan

3 0

3 years ago

The square rout of 7

____ [38]

Answer:

2.6457513111

Step-by-step explanation:

when seven is put into the square root it doesn't come out perfectly even instead it comes out as a decimal

3 0

4 years ago

Read 2 more answers

What is the solution to log2(2x^3-8)-2log2x=log2x?

Alexxandr [17]

Answer:

Step-by-step explanation:

$\\\\\text{Domain:}\\\\2x^3-8>0\ \wedge\ x>0\\2x^2>8\to x^3>4\to x>\sqrt[3]4\\\\x\in(\sqrt[3]{4},\ \infty)\\\\\log_2(2x^3-8)-2\log_2x=\log_2x\qquad\text{add}\ 2\log_2x\ \text{to both sides}\\\\\log_2(2x^3-8)=3\log_2x\qquad\text{use}\ n\log_ab=\log_ab^n\\\\\log_2(2x^3-8)=\log_2x^3\iff2x^3-8=x^3\qquad\text{subtract}\ 2x^3\ \text{from both sides}\\\\-8=-x^3\qquad\text{change the signs}\\\\8=x^3\to x=\sqrt[3]8\\\\x=2\in D$

5 0

3 years ago