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yan [13]
3 years ago
7

The sum of the digits of a certain two-digit number is 11. When you reverse its digits you increase by 9. What is the number?

Mathematics
1 answer:
jarptica [38.1K]3 years ago
8 0
The number is composed by two digits, let them be ab, so we have:
a + b = 11

this is a pseudo-equation, we are not multiplying ab or ba, is just the digits order.
ba = ab + 9
The pairs of numbers that could comply with the first equation are:
(2,9)
<span>(3,8)
</span><span>(4,7)
</span><span>(5,6)
</span>But only the last couple <span>(5,6) comply as well with the second condition. Because 65 = 56 + 9
Therefore the unknown number is 56</span>
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Which is a recursive formula for the sequence 99.4, 0, –99.4, –198.8, where f(1) = 99.4?
NNADVOKAT [17]

f(x)= -99.4x + 198.8

f(1) = -99.4*1 + 198.8 = 99.4

f(2) = -99.4*2 + 198.8 = 0

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5 0
3 years ago
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Which inequality is true
yarga [219]

The inequality that is true is 7π > 21

<h3>How to determine the inequality that is true?</h3>

To do this, we simply test the given inequalities (starting from the first)

The first inequality is represented as

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Divide both sides of the inequality by 7

So, we have:

7π/7 > 21/7

Evaluate the quotient of 21 and 7

So, we have:

7π/7 > 3

Evaluate the quotient of 7π and 7

So, we have:

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The above inequality is true.

This is so because π = 3.14 and 3.14 > 3

Hence, the inequality that is true is 7π > 21

Read more about inequality at

brainly.com/question/24372553

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6 0
1 year ago
After a history test with 20 questions, the teacher asks his students to write down the number of the questions that was the mos
asambeis [7]

Answer:

i think it would be d

Step-by-step explanation:

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hope this helps.

4 0
3 years ago
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PLEASEEEEEE HELP ME WITH THIS PLEASE
Maksim231197 [3]

Question 1

r(q(-2))=r(3)=11

Question 2

q(r(-2))=q(6)=-13

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