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3 years ago

Solve & Explain your Math thinking 12-7

Mathematics

2 answers:

Tom [10]3 years ago

4 0

For this case we have the following subtraction:

$12-7$

We can rewrite the subtraction in an easier way.

We have then:

$12-7 = 12 - (5 + 2)$

Then, by doing associative property we have:

$12 - (5 + 2) = (12-2) - 5\\(12-2) - 5 = 10 - 5\\10 - 5 = 5$

Answer:

The value of the subtraction is given by:

$12-7 = 5$

Colt1911 [192]3 years ago

3 0

The answer is 5 because I used an example to get my answer. The example I used was "Anna had 12 slices of apples, and she ate 7 slices. How many slices she have left?" That is my example to help for my answer. Another way is to draw 12 things, like pieces of candy, and cross out 7 pieces of candy, then count how many pieces of candy I haven't cross out.

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If triangle ABC is congruent to triangle DEF, which statement is not true?

Blizzard [7]

When you name two congruent triangles with the letters of the vertices, you have to keep the order of the corresponding vertices. That means, that when you say triangle ABC is congruent to DEF, the corresponding congruent angles are A = D, B = E, and C = F. regarding the sides, segment AB = segment DE, segment BC = segment EF, and segment CA = segment FD. Then, the answer is that, of the four options, the one that is not true is the option b, because as we already said the corresponding equal angle C is F, not E.

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3 years ago

25 points! Just checking is the answer 20y^8y^3

Vanyuwa [196]

Answer:

$\boxed{D. 20 {x}^{6} {y}^{4}}$

Step-by-step explanation:

$(5 {x}^{2} y)(4 {x}^{4} {y}^{3} ) = 20 {x}^{6} {y}^{4}$

Rule need to remember to solve such questions:

${a}^{x} \times {a}^{y} = {a}^{x + y}$

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3 years ago

Read 2 more answers

Use your calculator to find the value of each trig function below. Round to the tenth place.

zepelin [54]

Answer: 0.7

Step-by-step explanation: use calculator XD

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4 years ago

The sequence 2,6,18,54 shows the number of sit-ups Alan can do each day.

jek_recluse [69]

Step-by-step explanation:

this sequence is geometric not arithmetic

HOw we know that ??

when we get a common difference that must Be equal

d=6-2=4 not equal to d=18-6=12

So it is not arithmetic

but when we get the common ratio that also must be equal

r=6/2=18/6=54/18=3 equal

So it is geometric

By using this equation:

a(n)=a(1)*r^(n-1)

and we have a(1)=2 , r=3

Explicit rule: a(n)=2*(3)^(n-1)

Recursive rule: a(n)= r * a(n-1)

a(n-1) ⇒ priviuse term

SO: a(n)= 3 * a(n-1)

For example:

a(3)= 3 * 6 =18

I really hope this helps <3

7 0

3 years ago

The assembly of a machine takes 3/4 hour there are 12 steps in the assembly process what is the average time for each step

S_A_V [24]

We can solve this two different ways. I'll do both, and you choose which one makes the most sense:
We can divide the fraction 3/4 by 12. remember, when we divide fractions, we flip the second fraction and change the sign to multiplication:
3/4 ÷12 [starting equation]
3/4 x 1/12 [flip and change sign]
3/48 [now reduce]
1/16 Each step takes 1/16 of an hour.
1/16 x 60 = 3 3/4, or 3.75 minutes

Second way:
3/4 of an hour is 3/4 of 60...45 minutes.
Still, we divide out:
45 ÷ 12 [starting equation]
3 9/12 [divide with remainder]
3 3/4 minutes...3.75 minutes

5 0

4 years ago