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andrey2020 [161]
2 years ago
8

you and Michael have a total of 21 books. if michael has twice as many books as you do how many books do you have?​

Mathematics
1 answer:
ankoles [38]2 years ago
8 0
7 because 7•3=21 and if he has as twice much as you 7•2=14 & 14+7=21 books together
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Help with this pleaseeee​
ELEN [110]

Answer:

(- 3, 37) and (- \frac{5}{2}, \frac{63}{2} )

Step-by-step explanation:

Given the 2 equations

2x² - y + 19 = 0 → (1)

y + 11x = 4 → (2) ← subtract 11x from both sides

y = 4 - 11x → (3)

Substitute y = 4 - 11x into (1)

2x² - (4 - 11x) + 19 = 0

2x² - 4 + 11x + 19 = 0

2x² + 11x + 15 = 0 ← in standard form

(2x + 5)(x + 3) = 0 ← in factored form

Equate each factor to zero and solve for x

2x + 5 = 0 ⇒ 2x = - 5 ⇒ x = - \frac{5}{2}

x + 3 = 0 ⇒ x = - 3

Substitute these values into (3) for corresponding values of y

x = - \frac{5}{2} : y = 4 + \frac{55}{2} = \frac{63}{2} ⇒ (- \frac{5}{2}, \frac{63}{2} )

x = - 3 : y = 4 + 33 = 37 ⇒ (- 3, 37 )

4 0
2 years ago
Please help me with problem 1 of Properties of Multiplication with Whole Numbers
kobusy [5.1K]

This is the associative property, since any numbers can <em>associate </em>with each other, via the parentheses.

8 0
3 years ago
The product of negative 7 and a number squared is negative 28
sertanlavr [38]

Answer:

2

Step-by-step explanation:

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5 0
2 years ago
Help is needed asap​
Wewaii [24]

Answer:

3.8

Step-by-step explanation:

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3.8

Hope this helps!

6 0
3 years ago
Read 2 more answers
Can a quadrilateral be a rhombus ?
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Yes it can.  It doesn't <em>have to be</em>, but it can be without too much trouble.

In fact, ALL rhombuses are quadrilaterals.


6 0
3 years ago
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