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3 years ago

How do u simplify each expression by combining like terms?

Mathematics

1 answer:

Masja [62]3 years ago

6 0

Answer:

1. 8y - 9y = -1y

( 8 - 9 = -1)

3. 8a - 6 +a - 1

( i have showed the like terms here)

8a - 1a= 7a

-6 - 1 = -7

7a - 7

5. -x - 2 + 15x

( i have showed the like terms here)

-x + 15x = 14x

(x = 1)

14x + 2

7. 8d - 4 - d - 2

( i have showed the like terms here)

8d - d = 7d

-4 -2 = -6

7d - 6

8. 9a + 8 - 2a - 3 - 5a

( i have showed the like terms here)

9a - 2a - 5a = 2a

8 - 3= 5

2a + 5

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2 Points

Over [174]

Answer:

A. Five places to the left

Step-by-step explanation:

Scientific notation is a method used so we can show a very big/small number easier. Rather than putting so many zeroes, we put the number in the format of a number multiplied by 10^x.

Before putting a number into scientific notation, you need to know which number is a significant figures. In this question, there are two significant figure which is 39, all zeroes on the right is insignificant. We can move the decimal to convert the number into 3.9 * 10^5. Basically you need to move the decimal to the left if the exponent positive, but move it to the right if its negative. The exponent is +5 so we move the decimal points 5 places to the left.

6 0

3 years ago

Calculate the surface area of the closed half-cylinder. all measurements are in cm

AVprozaik [17]

Answer:

2656.31 $cm^{2}$

Step-by-step explanation:

To calculate the surface area, we need to find the area of all the faces, and add them together.

The faces of the cylinder are: the rectangular base, the curved top, and the two semicircles on the side.

Rectangular base:

A = length x width

A = 29.3 x 16.2

A = 474.66

Two semicircles:

A = $\pi$ x $radius^{2}$ (I'm using the formula for a circle, because the two semicircles are identical, so together they form a circle)

radius = 29.3/2 = 14.65

A = $\pi$ x $14.65^{2}$

A = 674.256 (rounded to 3 decimal places)

Curved top:

The curved top, when flattened out, becomes a rectangle with a length of 16.2. The width is equal to half the circumference of the circle formed by the two semicircles.

To find the width, use the circumference (C) formula.

C = $\pi$ x diameter

diameter = 29.3

C = $\pi$ x 29.3

C = 93.049 (rounded to 3 DP)

Area (of curved top) = length x width

A = 16.2 x 93.049

A = 1507.394 (rounded to 3 DP)

Surface Area

SA = 474.66 + 674.256 + 1507.394

SA = 2656.31 $cm^{2}$

8 0

3 years ago

Will drank 3⁄4 of a cup of milk at breakfast and 5⁄6 of a cup of milk at lunch. How much milk did he drink in total?

coldgirl [10]

Answer:

1 7/12 cups

Step-by-step explanation:

3/4 + 5/6

LCM of 4 and 6 is 12 so we have

9/12 + 10/12

=19 / 12

= 1 7/12 cups of milk

5 0

3 years ago

A 2-column table with 6 rows. Column 1 is labeled Number of Items Made with entries 1,125, blank, blank, blank, blank, blank. Co

Nadya [2.5K]

Answer:

4,500 items are made every 4 hours.

5,625 items are made every 5 hours.

Step-by-step explanation:

when you multiply 1125 by for it will equal 4500 and when you multiply 1125 by 5 it will equal 5625

3 0

4 years ago

Read 2 more answers

Find the geometric mean between each pair of numbers. 12 and 2.4

Scorpion4ik [409]

Answer:

about 5.37

Step-by-step explanation:

Geometric mean is

$\sqrt[n]{x_1(x_2)(x_n)...} }$

So square root of 12(2.4)

square root of 28.8 is

about 5.366563146

or 5.37

3 0

3 years ago