Who was the first prince of Russia to be crowned as a czar

12+[(15-5)]+(9-3)] what is the answer

kherson [118]

Answer:

28

Step-by-step explanation:

12+[(15-5)]+(9-3)]

PEMDAS

Parentheses first

12+[(10)]+(6)]

Then add

12+10+6

6 0

4 years ago

Read 2 more answers

Hi. Please help me with these questions See image for question.Answer no 6 and 7

Gnom [1K]

Answer:

6. See solution
7. k = 2, k = -6

Step-by-step explanation:

6.

Given equation:

2(x + 2)² + p(x + 1) = 0

The sum of the roots is q1 and the product of the roots is q2

Need to show that q1+q2 = 0

<h3>Solution</h3>

Bringing the equation into standard form of ax² + bx + c = 0:

2(x + 2)² + p(x + 1) = 0
2x² + 8x + 8 + px + p = 0
2x² + (p + 8)x + (p + 8) = 0

Sum of the roots:

q1 = - b/a = -(p + 8)/2

Product of the roots:

q2 = c/a = (p + 8)/2

We see that q1 and q2 are opposite numbers, therefore their sum equals zero:

q1 + q2 = -(p + 8)/2 + (p + 8)/2 = 0

=============================================

7.

Given quadratic equation:

x² - (k + 2)x + 4 = 0

It has equal roots

Need to find the possible values of k

<h3>Solution</h3>

When the quadratic equation has equal roots, then its discriminant is equal to zero:

D = 0
√b² - 4ac = 0
√(-k -2)² - 4*1*4 = 0
√k² + 4k + 4 - 16 = 0
√k² + 4k - 12 = 0
k² + 4k - 12 = 0
k = {-4 ± √4² -4*1*(-12)}/2
k = (-4 ± √16 + 48)/2
k = (-4±√64)/2
k = -2 ± 4
k = 2, k = -6

7 0

3 years ago

Rebecca wants to put 544 pennies in a coin collection book. the blue book fits 9 pennies per page. the red book fits 7 pennies p

natali 33 [55]

If she uses the blue book then she will need,

544/9 ≈ 61 pages

If she uses the red book the she will need,

544/7 ≈ 78 pages

So she will need 17 more pages if she uses the red book.

Hope this helps :)

6 0

4 years ago

at an arcade there are 57 tokens for a party. since it is willis’ birthday, he takes 12 tokens. The remaining tokens are shared

nikklg [1K]

Answer:

9 tokens

Step-by-step explanation: $\frac{45}{5}$

5 = Amount of friends

12 = Amount of tokens that Will takes

57 = total amount of tokens.

45 = amount of tokens left over after Will takes 12.

57 - 12 = 45

$\frac{45}{5}$

9

4 0

3 years ago

Need help Its Geomety

Akimi4 [234]

Step-by-step explanation:

Side CF is 10 due to opposite sides paralleogram theorem

FE is 15 also.

CE is 14 since it bisects it other half

GD is 11 since it half of 22.

6 0

3 years ago