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3 years ago

Subtract - 20 from - 25.

Mathematics

2 answers:

Nadya [2.5K]3 years ago

8 0

Answer:

-5.

Step-by-step explanation:

- 25 - (-20) Note: - * - = + so

= -25 + 20

= -5.

I am Lyosha [343]3 years ago

6 0

Answer: -45

they have the same sign so you add them together and keep the sign

“same sign, add and keep (the - or + sign)

different signs, subtract

keep the sign of the bigger number

then you’ll be exact”

Step-by-step explanation:

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Perform the multiplication, (7x2+a2)(x2–3a2)

aksik [14]

Answer:

The given multiplied expression is

$(7x^2+a^2)(x^2-3a^2)=7x^4-20x^2a^2-3a^4$

Step-by-step explanation:

Given expression is $(7x^2+a^2)(x^2-3a^2)$

To find the multiplication of the given expression :

$(7x^2+a^2)(x^2-3a^2)$

By using the distributive property to solve the given expression as below

$(7x^2+a^2)(x^2-3a^2)=(7x^2)(x^2)+(7x^2)(-3a^2)+(a^2)(x^2)+(a^2)(-3a^2)$

$=7x^2.x^2-21x^2a^2+a^2x^2-3a^2.a^2$

$=7x^{2+2}-21x^2a^2+a^2x^2-3a^{2+2}$ ( by using the property $a^m.a^n=a^{m+n}$ )

$=7x^4-21x^2a^2+a^2x^2-3a^4$

Adding the like terms in the above expression we get

$=7x^4-20x^2a^2-3a^4$

Therefore $(7x^2+a^2)(x^2-3a^2)=7x^4-20x^2a^2-3a^4$

Therefore the given multiplied expression is

$(7x^2+a^2)(x^2-3a^2)=7x^4-20x^2a^2-3a^4$

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3 years ago

Evaluate the expression -4x+5y-14 when x=0 and y= 3/5

emmainna [20.7K]

Answer:

-11

Step-by-step explanation:

Plug in 0 for x and 3/5 for y into the expression

-4(0) + 5(3/5) - 14

Multiply the numbers inside the parentheses

0 + 3 - 14

3 - 14 = -11, which is your answer

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3 years ago

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Sati [7]

Answer:

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David bought a pizza for $12.74 and four medium drinks. Define a variable and write an expression to represent the total amount

SSSSS [86.1K]

You could say each drink is d. And we'll say the total is t. David got 4 drinks,

So... 12.74 + 4d = t

Hope this helps!

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3 years ago

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Mama L [17]

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