MATHEMATICS MIDDLE SCHOOL

Jacob is showing his steps to solve the expression −27.8 ÷ 1 over 7.In which step did Jacob make an error?

Step 1: −27.8 ÷ 1 over 7
Step 2: −27.8 ⋅ 7

Step 3: −194.6

Step 1

Step 2

Step 3

There is no error.

Answers

Answer 1
Answer:

Answer:

D.There is no error.

Step-by-step explanation:

We are given that Jacob is showing his steps to solve the expression

-27.8/(1)/(7)

We have to find the error in Jacob steps in which he makes error

Jacob writes his first step

Step:1 -27.8/ (1)/(7)

Jacob's first step is true.

We know that if we changes  divide sign of term  into multiply then the the term which is write on right side of divide sign reciprocal. Therefore,

Step:2-27.8*7=-27.8\cdot 7

Hence, Jacob's second step is right.

Now ,  we multiply -27.8 with 7 then we get

Step:3 -27.8\cdot7=-194.6

Hence, Jacob's third step is also right.

Therefore, Jacob makes no error in his steps.

Hence, Option D is true.
Answer 2
Answer: There is no error, Jacob did everything right :)

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Find the ratio of black cell phone covers sold to the total number of cell phones covers sold last week. Then explain its meaning = info belowGreen Cover :5
Silver Cover:6
Red Cover:3
Black Cover:4

Answers

The ratio here would be 4 to 18, in which 4 represents the number ofblack covers sold and 18 represents the total of covers sold.

The correct answer is:

4:18, which means that 4 out of every 18 covers sold are black.

Explanation:

To find the ratio of black cases to total, we must first find the total number of cases sold: 5+6+3+4 = 18.

This makes the ratio of black to total 4:18.

The explanation is that 4 cases out of every 18 will be black.

Please help 1/7x-3 5/7 > 4/7x-5 6/7

Answers

\frac { 1 }{ 7 } x-\left( 3+\frac { 5 }{ 7 } \right) >\frac { 4 }{ 7 } x-\left( 5+\frac { 6 }{ 7 } \right)

\n \n -\left( 3+\frac { 5 }{ 7 } \right) +\left( 5+\frac { 6 }{ 7 } \right) >\frac { 4 }{ 7 } x-\frac { 1 }{ 7 } x

\n \n -3-\frac { 5 }{ 7 } +5+\frac { 6 }{ 7 } >\frac { 3 }{ 7 } x\n \n 2+\frac { 1 }{ 7 } >\frac { 3 }{ 7 } x

\n \n \frac { 14 }{ 7 } +\frac { 1 }{ 7 } >\frac { 3 }{ 7 } x\n \n \frac { 15 }{ 7 } >\frac { 3 }{ 7 } x

\n \n \frac { 7 }{ 3 } \cdot \frac { 15 }{ 7 } >\frac { 3 }{ 7 } x\cdot \frac { 7 }{ 3 } \n \n \frac { 15 }{ 3 } >x\n \n \therefore \quad x<5

you miss three out of 10 questions on a science quiz and four out of 15 questions on the math quiz which quiz has a higher percent of correct answers

Answers

Answer:

4 out of 15 has the higher correct answer percentage

Step-by-step explanation:

Step 1:  Find the percentages.

If you missed 3/10 questions, then you got 7/10 right.

7/10 = 70%

If you missed 4/15 questions, then you got 11/15 right.

11/15 = 73%

So, you scored a 70% on the science quiz, and a 73% on the math quiz.

ANSWER:

The math quiz.

Find two possible factor for the estimated product of 2800

Answers

28×100 and 70×40!!!!!!

Hannah just bought a new camera. In January she took 14 pictures. The number of pictures she took doubled each month for three months. A. how many pictures did hannah take in march? Write and solve an expression with an exponent to show how many pictures she took.

B. In April, Hanna took 1/2 the number of pictures she took in March. Her brother Jack thinks she took the same number of pictures in April that she did in February. Hannah knew he was incorrect. Write and solve an expression to show why Hannah is right.

Answers

January = 14 pictures

Number of pictures she took doubled each month for three months.
February : 14 x 2 =   28
March      : 28 x 2 =   56
April         : 56 x 2 = 112

A) March: 14 x 2² = 14 x 4 = 56 pictures

B) April : 56 pictures * 1/2 = 28 pictures

I think the same way Jack does. 

Answer:

42 pictures

Step-by-step explanation:

Given ~ and AB = 20, CA = 8, and US = 9, what is ST?
Does anyone know?

Answers

ST would be 22.5. 
Assuming ΔABC and ΔSTU are similar, they have to be proportional, so you could create a proportion to figure it out: 8/20=9/? (if you need to know how I got that, message me). Then you could cross multiply. 9x20 is 45, so that means that the measure of ST times 8 has to equal 45. If you divide 45 by 8, you get 22.5, so that makes the measure of ST 22.5.
(Sorry if that was confusing, I can always take a picture of my work if you need further explanation)
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