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3 years ago

Simplify the following polynomial expression. A. B. C. D. (5x^4-9x^3+7x-1)

Mathematics

1 answer:

jek_recluse [69]3 years ago

4 0

Answer:

The answer to the expression (5x^4-9x^3+7x-1) = -98

Step-by-step explanation:

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Solve with substitution. Show each step of your work<br><br> 4x + y = 12<br> 6x + 2y = 18

Svetach [21]

4x + y = 12
Get y by itself
Subtract 4x
y = -4x + 12

Since you know what y is, you can plug the value into the second equation

6x + 2(-4x + 12) = 18
6x - 8x + 24 = 18
-2x = -6
x = 3

Plug the value 3 into x for y = -4x + 12 in order to find y
-4(3) + 12 = y, y = 0

Solution: x = 3, y = 0

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3 years ago

A map has a scale of 1 inch : 40 miles. Use the given map distance to find the actual distance.

Ad libitum [116K]

If it is 1/40 as the ratio then multiple the top by 12 and bottom by 12 to get 480 miles

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3 years ago

Read 2 more answers

If RX=4 and XS=9, then XT=<br> And how do you get it?

konstantin123 [22]

Answer:

XT=6 units

Step-by-step explanation:

The picture of the question is the attached figure

step 1

In the right triangle RST

Applying the Pythagorean theorem

$RS^2=RT^2+TS^2$

we have

$RS=RX+XS=4+9=13\ units$ ---> by segment addition postulate

substitute

$RT^2+TS^2=169$ ----> equation A

step 2

In the right triangle RTX

Applying the Pythagorean theorem

$RT^2=RX^2+XT^2$

we have

$RX=4\ units$

substitute

$RT^2=4^2+XT^2$

$RT^2=16+XT^2$

$XT^2=RT^2-16$ ----> equation B

step 3

In the right triangle XTS

Applying the Pythagorean theorem

$TS^2=XS^2+XT^2$

we have

$XS=9\ units$

substitute

$TS^2=9^2+XT^2$

$TS^2=81+XT^2$

$XT^2=TS^2-81$ ----> equation C

step 4

equate equation B and equation C

$TS^2-81=RT^2-16$

$TS^2-RT^2=81-16$

$TS^2-RT^2=65$ ----> equation D

step 5

Solve the system

$RT^2+TS^2=169$ ----> equation A

$TS^2-RT^2=65$ ----> equation D

Solve by elimination

Adds equation A and equation D

$RT^2+TS^2=169\\TS^2-RT^2=65\\---------\\TS^2+TS^2=169+65\\2TS^2=234\\TS^2=117$

Find the value of RT^2

$RT^2+117=169\\RT^2=52$

step 6

Find the value of XT

equation C

$XT^2=117-81\\XT^2=36\\XT=6\ units$

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3 years ago

How can you make a fraction into a whole number?

Assoli18 [71]

See how many times the denominator (bottom # of fraction) can go into the numerator (bottom number of fraction).

If i DOES NOT go in evenly then you will get an answer with a mixed fraction. How many times the denominator goes into the numerator is the whole number in the answer, then the remainder is the new numerator and you keep the same denominator.

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3 years ago

Eduardwww [97]

The answer to the question is b

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4 years ago