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2 years ago

Expand (2x-5y)⁷ and find fourth form

Mathematics

1 answer:

elena55 [62]2 years ago

3 0

Step-by-step explanation:

By binomial theorem,

T(r+1) = nCr * a^(r+1) * b^r

Term 4 = 7C3 * (2x)^4 * (-5y)^3 = 35 * (16x^4) * (-125y^3) = -70000x^4y^3.

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Anna is saving to buy a new cell phone. Her mother is helping Anna by contributing money each month. What is the ratio between t

Dmitry [639]

Answer:

Option D. 3:1, $120

Step-by-step explanation:

The complete question in the attached figure

Part 1) What is the ratio between the amount of money contributed by Anna and the amount contributed by her mother?

Let

x -----> the amount of money contributed by Anna

y ----> the amount of money contributed by her mother

we know that

Looking at the table

The value of x is equal to $x=\$30+\$60+\$90+\$120=\$300$

The value of y is equal to $y=\$10+\$20+\$30+\$40=\$100$

Find the ratio x/y

substitute the values

$\frac{x}{y}=\frac{300}{100}=\frac{3}{1}$

Part 2) What was the total amount saved in April?

we know that

To find out the total amount saved in April, adds Mon's contribution in April plus Anna's contribution in April

$(\$30+\$90)=\$120$

3 0

3 years ago

Read 2 more answers

What is the domain of (1,2),(2,6),(3,10),(2,14),(1,0)

Bas_tet [7]

The set of x ordinates or {1,2,3}

5 0

2 years ago

Find domain and range.<br>

user100 [1]

Answer:

Domain: all real values of x

Range: f(x)》-4

Domain: all real values except x = 0

Range: All real values except f(x) = 0

Step-by-step explanation:

Domain: all real values of x

Range: f(x)》-4

Because this is a concave up quadratic with a minimum turning point at (0,-4)

Domain: all real values except x = 0

Range: All real values except f(x) = 0

Since x is in the denominator, it can't be 0

For f(x) = 0, x has to be infinity

3 0

3 years ago

Find the surface area of the solid shown or described. If necessary, round to the nearest tenth. Use the formula, write it out,

Mkey [24]

$\bold{ANSWER:}$
163.9 m^2

$\bold{SOLUTION:}$

7 0

1 year ago

What fractions are equal to 4/5

Tresset [83]

There are as many fractions equal to 4/5 as there are numbers, but here are a couple that fit:
20/25
8/10
12/15
<span>100/125
...etc. Hope that answered your question :)

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6 0

2 years ago

Read 2 more answers

Expand (2x-5y)⁷ and find fourth form​

Expand (2x-5y)⁷ and find fourth form