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8090 [49]
3 years ago
15

Can someone please help me?

Mathematics
2 answers:
Vanyuwa [196]3 years ago
8 0
I’m dumb so I have no idea
den301095 [7]3 years ago
3 0
Idk try Socratic it’s low key
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Find the sum of the first 90 terms of the sequence -4,-1,2,5,8
telo118 [61]

Answer:

1655

Step-by-step explanation:

Note the common difference d between consecutive terms of the sequence

d = - 1 - (- 4) = 2 - (- 1) = 5 - 2 = 8 - 5 = 3

This indicates the sequence is arithmetic with sum to n terms

S_{n} = \frac{n}{2} [ 2a₁ + (n - 1)d ]

Here a₁ = - 4, d = 3 and n = 90, thus

S_{90} = \frac{90}{2} [ (2 × - 4) + (89 × 3) ] = 45(- 8 + 267) = 45 × 259 = 1655

4 0
3 years ago
Which pair of ratios forms a proportion?​
bogdanovich [222]

Answer:

a

Step-by-step explanation:

8 0
3 years ago
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Please help me solve this. 10 points!
olga nikolaevna [1]

Answer:

the answer is:

j= 76

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6 0
3 years ago
Use the figure to the right to find the missing lengths of the triangle.
pychu [463]

To find AB(x) and BC(y), you can do(there are multiple ways you can do this):

tan A = \frac{y}{7}

tan 60° = \frac{y}{7} or (tan 60°) · 7 = y

tan 60° = \frac{\frac{\sqrt{3} }{2} }{ \frac{1}{2} } = \sqrt{3}

√3 · 7 = y

7√3 cm = y


sin B = \frac{7}{x}

sin 30° = \frac{7}{x} or x= \frac{7}{sin 30}

sin 30° = \frac{\frac{1}{2} }{1} = \frac{1}{2}

x = \frac{7}{\frac{1}{2} } = 14

x = 14 cm


AB = 14cm

BC = 7√3 cm

8 0
3 years ago
Which is an exponential decay function
Pani-rosa [81]

Answer:

Letter A is your answer

Step-by-step explanation:

mark me brainliest

5 0
3 years ago
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