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3 years ago

Pretty please help!(:

Mathematics

2 answers:

ehidna [41]3 years ago

8 0

Well folks this ain’t it either. Keep on chugging.

aliya0001 [1]3 years ago

7 0

I believe the answer is C

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What is the value of x and y if 21x+7y=42 and -5x+5y=10 are equal

nikdorinn [45]

Answer:

-5x/5 +5y/5=10/5=2

y-x=2

y=x+2

21x+7*(x+2)=42

21x+7x+14=42

28x=42-14

28x=28

x=1

y=1+2

y=3

Step-by-step explanation:

7 0

2 years ago

I really need the help please and thank you

Umnica [9.8K]

Answer:

B. $f^{-1}(x)=\frac{x-4}{5}$

Step-by-step explanation:

To find the inverse of a function/equation:

Replace f(x) with y: y=5x+4
Switch x and y: x=5y+4
Solve for y: x-4=5y -> $y=\frac{x-4}{5}$
Write in standard inverse notation: $f^{-1}(x)=\frac{x-4}{5}$

I hope this helps!!

gl!

3 0

2 years ago

Daniel has a beginning balance of $675 in his checking account. He writes two checks for $530 and $200. He has a deposit of $340

GenaCL600 [577]

$675.00 - $530.00 = $145.00
$145.00 - $200.00 = $55.00 negative balance, amount short.
$55.00 + 340.00 = $285.00 positive balance after deposit.
$285.00 - $29.00 = $256.00 new balance
Daniel has a new balance of $256.00

7 0

2 years ago

In the isosceles trapezoid, m∠S=68∘ .<br><br> What is m∠Q ?

zmey [24]

9514 1404 393

Answer:

112°

Step-by-step explanation:

Same-side angles of a trapezoid are supplementary.

m∠P = 180° - m∠S = 180° -68° = 112°

The angles of an isosceles trapezoid match their symmetrical counterparts.

m∠Q = m∠P

m∠Q = 112°

5 0

3 years ago

Prove the polynomial identity.

Kaylis [27]

Answer:

Proven

Step-by-step explanation:

We prove the polynomial with factorization. We must first simplify the expression before we can factorize:

$(4\cdot{x^2}-2)\cdot{(4\cdot{x^2}-2)}-16\cdot{x^4}$

$16\cdot{x^4}-8\cdot{x^2}-8\cdot{x^2}+4-16\cdot{x^4}$

$4-16\cdot{x^2}$

4 is the common number and we can take it out of the expression:

$4\cdot{(1-4\cdot{x^2})}$

We can factorize further with the x term being zero. For this to be true we must have -2x and 2x to cancel out and therefore the expression is proven:

$4\cdot{(1-2\cdot{x})}\cdot{(1+2\cdot{x})}$

5 0

2 years ago