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3 years ago

Combine the like terms to make a simpler expression: 8r +7 -6r - 5 =

Mathematics

2 answers:

baherus [9]3 years ago

5 0

8r and -6r are like terms. What is 8r-6r?

Scorpion4ik [409]3 years ago

5 0

Okay so 8r + 7 - 6r -5

step one: collect like terms

(8r-6r)+7-5

step two: simplify

2r+7-5

step three: simplify even more

2r+2 (should be the answer)

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2) f(x) = 27x^6+ 1524x^3+125

Norma-Jean [14]

Answer:

Step-by-step explanation:

Let x^3 = y

f(x) = 27(x^3)^2 + 1524(x^3) + 125

f(x) = 27 y^2 + 1524y + 125

You can now put this into the quadratic formula. When you do, you get

(y + 0.0821)(y+56.3623) = 0

So now you substitute x^3 into this

(x^3 + 0.0821)(x^3 + 56.3623)

x^3 + 0.0821 = 0

x^3 = - 0.0821

cuberoot x^3 = cube root 0.0821

x = - 0.4346

x^3 = - 56.3623

x = - 3.8341

8 0

3 years ago

Find the value of this expression if x = 2 and<br> y= 1.

N76 [4]

Answer: 2/5

Step-by-step explanation:

xy^2

--------

If x = 2 and y = 1

x * y^2 2 × 1^2

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5 5

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6 0

3 years ago

A family built a house and wanted to put down in their rectangular yard. The sod costs $0.32 per square foot plus 10 per square

sammy [17]

Answer:

The total cost of purchasing and laying sods in the rectangular yard is $2,146.67

Step-by-step explanation:

We are given the following in the question:

Dimensions of rectangular yard:

Length = 50 feet

Width = 30 feet

Area of rectangular yard =

$A = \text{Length}\times \text{Width}\\A = 50\times 30\\A = 1500\text{ square feet}$

Cost of sod = $0.32 per square foot

Total cost of sod =

$C_1 = \text{Unit cost of sod}\times \text{Area of yard}\\C_1 = 0.32\times 1500\\C_1 = 480\$$

Cost of laying sods = $10 per square yard

Total cost of laying sod =

$C_2 = \text{Unit cost of laying sod}\times \text{Area of yard}\\\\\text{1 square yard}=\dfrac{1}{9}\text{Square foot}\\\\C_2 = 10\times \dfrac{1500}{9}\\\\C_2 = 1666.67\$$