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AfilCa [17]
3 years ago
13

Megan's cousin wants to buy a new sound system for his car. She goes to the electronics store to help him to pick it out. The ba

se system costs $395. Adding a subwoofer is an additional $89. Two extra rear speakers are $75 each. And upgrading to a six-CD disk changer is an additional $225. Round each amount to the nearest hundred dollars to find a reasonable estimate for the total cost of the new sound system. A. $600 B. $650 C. $700 D. $900
Mathematics
1 answer:
Nikitich [7]3 years ago
5 0

Answer:D


Step-by-step explanation:


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A mother is 13/4 times as tall as her son. Her son is 3 feet tall how tall is the mother.
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1. Kalena was asked to prove ifx(x - 1)(x + 1) = x3 - X represents a polynomial identity. She
Verdich [7]

Answer:

C. Kalena made a mistake in Step 3. The justification should state: -x²

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Step-by-step explanation:

Given the function x(x - 1)(x + 1) = x3 - X

To justify kelena proof

We will need to show if the two equations are equal.

Starting from the RHS with function x³-x

First we will factor out the common factor which is 'x' to have;

x(x²-1)

Factorising x²-1 using the difference of two square will give;

x(x+1)(x-1)

Note that for two real number a and b, the expansion of a²-b² using difference vof two square will give;

a²-b² = (a+b)(a-b) hence;

Factorising x²-1 using the difference of two square will give;

x(x+1)(x-1)

Factorising x(x+1) gives x²+x, therefore

x(x+1)(x-1) = (x²+x)(x-1)

(x²+x)(x-1) = x³-x²+x²-x

The function x³-x²+x²-x gotten shows that kelena made a mistake in step 3, the justification should be -x²+x² not -x-x²

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3 years ago
Find the coordinates of the intersection of the diagonals of parallelogram GHJK with vertices G(0,2), H(4,2), J(3,0), and K(-1,0
zimovet [89]

Answer:

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Step-by-step explanation:

The midpoint of G and H is at (2,2).

The midpoint if J and K is (1,0)

The midpoint of the two midpoints is (1.5,1)

You could also i.e. directly ask for the midpoint of H an K, OR, G and J, and you would get the same final result.

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What is 80% of 960? Round to the nearest hundredth (if necessary).
Tatiana [17]

Answer:

Step-by-step explanation:

you could do (960/100)*80=768

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