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Mathematics

1 answer:

satela [25.4K]2 years ago

7 0

Answer:

a dilation with a scale factor less than 1 and then a translation

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when asked to factor the x^2 - 100, a student gives the answer (x -10) (x-10). what is wrong with this answer?

aalyn [17]

$x^2-100\\\\=x^2-10^2\\\\=(x+10)(x-10)\\\\\text{The difference of two squares formula is}~ a^2 -b^2 =(a+b)(a-b),\\\\\text{So, the student did not apply it properly}$

3 0

2 years ago

Evaluate 5.5r8.35s when r12 and s4.

Over [174]

Answer:

32.6

Step-by-step explanation:

when you plug in for s and r you will get 66-33.4 since 5.5 multiped by 12 is 66 and 8.35 multiplied by 4 is 33.4 .

then you subtract them and that's how you'll get your answer

3 0

3 years ago

The angle which is four times its complement is a. 60 b. 30 C. 45 d. 72

grigory [225]

Answer:

The answer is D.72°

Step-by-step explanation:

hope this helps.

5 0

3 years ago

Please help Explanation will be appreciated thanks,

Genrish500 [490]

Answer: A; 6.3%

Step-by-step explanation:

Problem 1

For the first problem, we first want to find y so that we can plug it into the expression.

We can use elimination method for the system of equations to solve.

3x+3y=21

3x-y=5

We subtract both equations to eliminate x.

4y=16 [divide both sides by 4]

y=4

Now that we know y, we can plug it into the expression.

$\frac{4}{2} -3$ [divide]

$2-3$ [subtract]

$-1$

We know that the answer is A.

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Problem 2

For the second problem, we need to know how to calculate percent error. The formula for precent error is $\frac{|measured-exact|}{exact} *100%$ . We know that the exact value is 80 because the buyer was supposed to given 80. 75 is the measured value because that was what the buyer was given.