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3 years ago

I don't get this one too can someone explain it please

Mathematics

1 answer:

lukranit [14]3 years ago

5 0

Answer:

15ab

Step-by-step explanation:

When you multiply out the square (p+q)^2, you get the trinomial ...

(p +q)^2 = p^2 + 2pq + q^2

Your binomial is (3a+2.5b), so you have ...

p = 3a

q = 2.5b

and the trinomial you get when you multiply it out is ...

(3a)^2 + 2(3a)(2.5b) + (2.5b)^2

= 9a^2 + 15ab + 6.25b^2

The first and last of these terms are shown on the right side of the given expression, so to finish out the identity, you need to replace * with 15ab.

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in the set of first ten natural numbers 1 1 1 2 3 4 5 6 7 8 9 10. a what is percent of numbers are odd? b what percent of number

Fittoniya [83]

Answer:

a)50%,b)70%

Step-by-step explanation:

odd=5

10=100%

5×100=500/10

=50%

10=100%

(7×100)/10=70

4 0

3 years ago

Jada bought $53 worth of snacks. She used a 10% off coupon. She then paid 8% tax on the original amount. What is the total she p

Montano1993 [528]

Answer:

The amount which Jada paid after discount and tax is $ 51.64

Step-by-step explanation:

Given as :

The original price of snacks = $ 53

The price of snacks after applying 10% off coupon = 53 - 10% of 53

Or , The price of snacks after applying 10% off coupon = 53 ( $\frac{100-10}{100}$ )

or, The price of snacks after applying 10% off coupon = 53 × 0.9 = $ 47.7

Now the tax applied on the original amount = 8 % of $ 53

or, the tax applied on the original amount = $\frac{8}{100}$ × 53

or, , the tax applied on the original amount = $\frac{424}{100}$ =$ 4.24

So The total paid amount = $ 47.4 + $ 4.24 = $ 51.64

Hence The amount which Jada paid after discount and tax is $ 51.64 Answer

6 0

3 years ago

Evaluate 2xy - 3x for x = - 2 and y = 7.

Slav-nsk [51]

Look below!
2(-2)(7)-3(-2)
-28-(-6)
(Don't forget that when you have two negative signs next to each other, you can make it addition)
SO, -28+6
=-22
Hope that helped!

3 0

3 years ago

Find the equation of a line that passes through points A and B.

mars1129 [50]

Answer:

y = 2x - 1

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = A(4, 7) and (x₂, y₂ ) = B(2, 3)

m = = = 2, thus

y = 2x + c ← is the partial equation

To find c substitute either of the 2 points into the partial equation.

Using B(2, 3), then

3 = 4 + c ⇒ c = 3 - 4 = - 1

y = 2x - 1 ← equation of line

6 0

3 years ago

Solve for x in the equation 2x2–5x+ 1 = 3.

Vikki [24]

OPTION D is the correct answer

5 0

4 years ago

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