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3 years ago

Given

Mathematics

1 answer:

arlik [135]3 years ago

3 0

Answer:

a = 3, b = - 7

Step-by-step explanation:

Substitute x = 2 into the equation and equate to 5, that is

a(2)² + b = 5

4a + b = 5 → (1)

Substitute x = 3 into the equation and equate to 20

a(3)² + b = 20

9a + b = 20 → (2)

Subtract (1) from (2) term by term to eliminate b

(9a - 4a) + (b - b) = (20 - 5), that is

5a = 15 ( divide both sides by 5 )

a = 3

Substitute a = 3 into either of the 2 equations and solve for b

Substituting in (1)

4(3) + b = 5

12 + b = 5 ( subtract 12 from both sides )

b = - 7

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1/9 of people in a class are left handed.

LenaWriter [7]

Answer:

left handed: right handed

1 : 8

Step-by-step explanation:

1 out of every 9 people are left handed

9-1 = 8

That means 8 of the 9 are right handed

left handed: right handed

1 : 8

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3 years ago

The swim team has 41 people on their team they need new swim gear the swim caps cost $5 and the swim suit cost $ 16 dollars how

IRISSAK [1]

Answer:

The money they will have to pay is $861.

Step-by-step explanation:

Given:

The swim team has 41 people on their team.

They need new swim gear the swim caps cost $5 and the swim suit cost $16.

Now, to find the money they will have to pay.

Number of people on the swim team = 41.

Cost of swim caps = $5.

Cost of swim suit = $16.

Now, to get the total money they will have to pay:

Number of people on the swim team× (cost of swim caps + cost of swim suit)

$=41\times (5 +16)$

$=41\times 21$

$=\$861.$

Therefore, the money they will have to pay is $861.

7 0

2 years ago

Your friend is 1.2 times taller than you. Your friend is 64.5 inches tall. How tall are you?

Andru [333]

You are X, if your friend is 1.2 times taller than you= 1.2X
That's why 64.5=1.2X
X=53.75
But you should write 53.8 inches tall. Because there is one number after point.
As a result, you are 53.8 inches tall

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2 years ago

Whats the total area of covered box with a length of 4ft a width oc 3ft and height of 6 ft

hodyreva [135]

The total area of a box is the sum of all the area of the faces it has. It is also called the surface area. The area of one face of a rectangular box is equal to the product of its length and width. So, the total area would be:

SA = 2lw + 2wh + 2lh
SA = 2(4)(3) + 2(3)(6) + 2(4)(6)
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2 years ago

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The temperature of the sun is 27 million degrees Fahrenheit. Use scientific notation to express the temperature.

Ipatiy [6.2K]

Answer:

Step-by-step explanation:

We know million has 6 zeros.

So, 1 million would be written as:

1,000,000

Similarly, 27 million would be written as:

27,000,000

We know writing a number in scientific notation would make this a decimal in 1 decimal place, so we would select "2.7" as the base of the scientific number.

Now, how many places to the right do we need to go (in 2.7) to make it 27,000,000?

Counting, we see: 7 places

So, power of 10 would be "7", thus we can write:

$2.7*10^7$

Answer choice A is right

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2 years ago

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