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4 years ago

2/5(a+2b)^2 (if a=3 and b=-4)

Mathematics

1 answer:

kondor19780726 [428]4 years ago

4 0

The answer is 10. Hope this helps.

Multiply the numbers

2/5 •(3-8)^2

Subtract (3-8)

2/5• (-5)^2

A negative base raised to an even power equals a positive

2/5• (5)^2

Reduce the expression with 5.

2•5

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Celia bought a bag of 12 goldfish for $3 dollars, What is the cost of 1 goldfish?

viktelen [127]

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3 years ago

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Help pls btw I will give brainly

goblinko [34]

Answer:

$\frac{3}{8}$ feet²

Step-by-step explanation:

The area ( A) is calculated as

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3 years ago

What is the length of AB?

Tresset [83]

Answer:

angle B'CA'= angle BCA..... (common angle)

angle B'A'C = angle BAC.....(corresponding angels)

therefore,

ΔCB'A' ~ ΔCBA. ......(by A-A test of similarity)

therefore,

B'A'/ BA. = CA'/ CA....(congruent sides of congruent triangles)

now, B'A' = 5, CA'= 6 , CA = 6 + 3 = 9

5 / BA. = 6 / 9

therefore, 5 / BA. = 2 / 3

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3 years ago

The sum of two numbers is 15. one number is 7 less then the other. what are the two numbers

Serjik [45]

Answer:

One number is 4, the other is 11

Step-by-step explanation:

"The sum of two numbers is 15" can be written as

x + y = 15 where x is one number, and y is the other. Their sum is 15

"one number is 7 less then the other' can be written as

x = y - 7 x is one number that is 7 less than the other

Now we know x = y - 7. We can plug that into the first equation x + y = 15 and solve...

The first equation is now...

y - 7 + y = 15 ('x' is substituted for y - 7)

Now solve...

2y - 7 = 15 (combine like terms)

2y = 22 (add 7 to both sides to isolate the term with the variable)

y = 11 (divide both sides by 2 to isolate the variable)

If y = 11, then

x + 11 = 15 (the 'y' in the first equation becomes 11)

Then x = 4 (subtract 11 from both sides to isolate x)

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