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3 years ago

PLEASE HELP IT'S 7TH GRADE MATH... MIGHT BE EASY FOR YOU

Mathematics

1 answer:

sineoko [7]3 years ago

7 0

1) X+12

2) 2x-5

3) 40-x

4) (x1/3)(12)

5) x0.25

6) 2x:4y

7) 12(x-1)

8) 3[(x)(-8)]

9) 7(2x+3)

10) (x-30)+(y-30)

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A toy store sells either small dolls or large dolls. If one person buys 6 small dolls and 5 large dolls and spends $65, and anot

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Each small doll cost 6.5 dollars and each large doll cost 10 dollars

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3 years ago

Read 2 more answers

Explain why if two triangles are congruent, then they have to also be similar.

RUDIKE [14]

Answer:

Because if 2 sides are congruent that means 2 sides are the same wich means that each that only one edge can change at a time. I hope this helps.

Step-by-step explanation:

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4 years ago

Complete the table so that f(x) is a function

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Where is table that has to be completed

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3 years ago

Your cell phone company Offers you a choice between two promotional deals you can either get 500 free text messages with the cha

ollegr [7]

Answer:

The number of messages that will cost same both plans is <u>1000</u>.

Step-by-step explanation:

Given,

For 1st offer:

Total number of messages = 500

Charge of each message after 500 messages = $0.10

For 2nd offer:

Total number of messages = 400

Charge of each message after 400 messages = $0.20

We need to find out the number of messages can be sent for equal cost of both plans.

Solution,

Let the number of messages be 'm'.

So For 1st offer:

Total cost 'c' is equal to fixed cost for 500 messages plus charge of each message multiplied with number of messages.

framing in equation form, we get;

$c=500+0.10m$

Again for 2nd offer:

Total cost 'c' is equal to fixed cost for 400 messages plus charge of each message multiplied with number of messages.

framing in equation form, we get;

$c=400+0.20m$

Now the question said that the charge would be the same.

So we can say that;

$500+0.10m=400+0.20m$

On combining the like terms, we get;

$500-400=0.20m-0.10m\\\\100=0.1m\\\\$

Now using multiplication property, we will multiply both side by '10' and get;

$100\times 10=0.1m\times10\\\\1000=m$

Hence The number of messages that will cost same both plans is <u>1000</u>.

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3 years ago

Solve the inequality and write the solution set using both set-builder notation and interval notation. -3a-15≤-2a+6

Karolina [17]

Answer:

$\{a$ ∈ $R\ -21 \le a \le \infty \}$ --- set builder

$[-21,\infty)$ --- interval notation

Step-by-step explanation:

Given

$-3a - 15 \le -2a + 6$

Required

Solve

Collect like terms

$-3a + 2a \le 15 + 6$

$-a \le 21$

Divide by -1

$a \ge - 21$

Rewrite as:

$-21 \le a$

Using set builder

$\{a$ ∈ $R\ -21 \le a \le \infty \}$

Using interval notation, we have:

$[-21,\infty)$

4 0

3 years ago