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3 years ago

If s(x) =2-x^2and t(x) =3x which value is equivalent to (s·t)(-7)

Mathematics

2 answers:

Katarina [22]3 years ago

6 0

the answer is 24 (x) -78

lord [1]3 years ago

3 0

Answer:

987

Step-by-step explanation:

(s.t)(x) = s(x) × t(x) = 3x(2 - x²) = 6x - 3x³

To evaluate (s.t)(- 7) substitute x = - 7 into the product

(s.t)(- 7) = 6(- 7) - 3(- 7)³ = - 42 + 1029 = 987

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3 years ago

Gabby has a bag containing 36 nickels and quarters. The total value of the coins is $5. How many quarters does gabby have?

olganol [36]

There are 20 nickels and 16 quarters

Solution:

Let "n" be the number of nickels

Let "q" be the number of quarters

We know that,

1 nickel = 0.05 dollar

1 quarter = 0.25 dollar

Gabby has a bag containing 36 nickels and quarters

Therefore,

n + q = 36

n = 36 - q ------- eqn 1

The total value of the coins is $5

Thus we frame a equation as:

number of nickels x 1 nickel + number of quarters x 1 quarter = 5

$n \times 0.05 + q \times 0.25 = 5$

0.05n + 0.25q = 5 ------- eqn 2

Substitute eqn 1 in eqn 2

0.05(36 - q) + 0.25q = 5

1.8 - 0.05q + 0.25q = 5

0.2q = 3.2

q = 16

Substitute q = 16 in eqn 1

n = 36 - 16

n = 20

Thus there are 20 nickels and 16 quarters

8 0

3 years ago

Suzanne has one 10p coin one 50p coin and some 20p coins altogether she has £1.40 how many 20p coins does she have

mash [69]

Answer:

She has FOUR 20p coins altogether.

Step-by-step explanation:

1.40-0.10-0.50=0.8

0.8/0.2=4

6 0

3 years ago

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Elenna [48]

Answer:

Step-by-step explanation:

The slope intercept form of a line is y=mx+b where m=slope and b=y intercept. So we should solve for y.

3x/5+25y=10, multiply all terms by 5 and the denominator cancels out

3x+125y=50, subtract 3x from each side

125y=-3x+50, divide both sides by 125

y=(-3+50)/125

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3 years ago

In a city, the distance between the library and the police station is 3 miles less than twice the distance between the police st

insens350 [35]

5 - 3= 2 x 2

4 miles

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4 years ago

If s(x) =2-x^2and t(x) =3x which value is equivalent to (s·t)(-7) ​

If s(x) =2-x^2and t(x) =3x which value is equivalent to (s·t)(-7)