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faltersainse [42]
3 years ago
6

Very urgent please help me

Mathematics
1 answer:
lorasvet [3.4K]3 years ago
4 0

Answer:

Step-by-step explanation:

8r + 9 + 7r + 6 = 90

15r + 15 = 90

15r = 75

r = 5

8(5) + 9 = 40 + 9 = 49

7(5) + 6 = 35 + 6 = 41

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BaLLatris [955]

Answer: B. 7d + 18

Step-by-step explanation:

7 ( d + 3 ) - 3

expanding , we have :

7d + 21 - 3

= 7d + 18

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6 0
4 years ago
Read 2 more answers
Find the vertex and the length of the latus rectum. x= 1/2 (y - 5)² + 7
GalinKa [24]

Answer:

Vertex = (7,5)

Length of latus rectum = 2 units

Step-by-step explanation:

The vertex form of a parabola is

x=a(y-k)^2+h    ...(1)

where, (h,k) is vertex and length of latus rectum is \left|\dfrac{1}{a}\right|.

The given equation is  

x=\dfrac{1}{2}(y-5)^2+7    ...(2)

On comparing (1) and (2), we get

h=7,k=5,a=\dfrac{1}{2}

So, vertex of parabola is (7,5).

Length of latus rectum is

L.R.=\left|\dfrac{1}{a}\right|=\left|\dfrac{1}{\frac{1}{2}}\right|=2

Therefore, the length of the latus rectum is 2 units.

3 0
4 years ago
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