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Dominik [7]
2 years ago
10

Help plzzzz.................

Mathematics
1 answer:
insens350 [35]2 years ago
7 0

Answer:

a = 6, b = - 12

Step-by-step explanation:

Expand the left side and compare the coefficients of like terms to those on the right side.

a(4x - 10) ← distribute parenthesis

= 4ax - 10a

Compare to 24x + 5b , then

4a = 24 ( divide both sides by 4 )

a = 6

Then

5b = - 10a = - 10(6) = - 60 ( divide both sides by 5 )

b = - 12

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5-7
uranmaximum [27]

Answer:

the third option

Step-by-step explanation:

what does that mean ?

to "rationalize" it is to transform it into a rational number (that is a number that can be described as a/b, and is not an endless sequence of digits after the decimal point without a repeating pattern).

a square root of a not square number is irrational (not rational).

so, what this question is asking us to get rid of the square root part in the denominator (the bottom part).

for this we need to multiply to and bottom with the same expression (to keep the whole value of the quotient the same) that, when multiplied at the bottom, eliminates the square root.

what can I multiply a square root with to eliminate the square root ? the square root again - we are squaring the square root.

so, what works for 9 - sqrt(14) as factor ?

we cannot just square this as

(9- sqrt(14))² = 81 -2sqrt(14) + 14

we still have the square root included.

but remember the little trick :

(a+b)(a-b) = a² - b²

without any mixed elements.

so, we need to multiply (9-sqrt(14)) by (9+sqrt(14)) to get

81-14 = 67 which is a rational number.

therefore, the third answer option is correct.

7 0
2 years ago
Sara had some buns she sold 5/9 of them, if she has 128 buns left. How many bums did she have at first?
mina [271]

Step-by-step explanation:

Maybe she had

128 + 9 = 137 buns

7 0
3 years ago
Read 2 more answers
Samantha needs 9 feet of fencing to make repairs from a storm. If the hardware store sells fencing only in yards, how much
Oksi-84 [34.3K]

It's C. because 3 yards is 9 feet

6 0
2 years ago
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The sales tax for an item is $44.10 and it cost $490 before tax. find the sales tax rate. write your answer as a percentage
svetoff [14.1K]

Answer:

9% sales tax

Step-by-step explanation:

44.10/490 =

.09

.09 as a percentage is also 9%

6 0
3 years ago
Anyone know this geometry question? Will give brainiest
12345 [234]
If AC must be parallel with BD and m∠6 is doubled, m∠3 must be doubled too. 

This is because of the following rule:
When two lines are parallel, which is the occasion with AB and CD, then the corners in which the intecepting parallel lines (AC and BD) stand must be the same. So corner 6 is equivalent to corner 3, corner 1 and corner 5. Corner 2 and corner 4 are equivalent too.
3 0
3 years ago
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