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Lana71 [14]
3 years ago
11

Pls help will give brainliest and 5star and thanks

Mathematics
1 answer:
LuckyWell [14K]3 years ago
7 0

Answer:

I believe that the answer is A . Q and R

Step-by-step explanation:


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the tens digit of a two digit number is twice the units digit. The sum of the digits is twelve. Find the original number.
KatRina [158]
X - tens digit
y - units digit

x=2y\\
x+y=12\\\\
2y+y=12\\
3y=12\\
y=4\\\\
x=2\cdot4\\
x=8\\\\
10\cdot8+4=\boxed{84}

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3 years ago
Scott uses a pattern to collect beetles. The table shows how many of each species he has. Use the pattern to find the missing nu
Darya [45]
It keeps going up by 2......3....4....5.... so the answer is easy, 15 + 6 = 21!
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2 years ago
20r3 − 16r2 + 15r − 12
kati45 [8]

Answer:

(5r-4)(4r^(2)+3)

Step-by-step explanation:

Hope it helps

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3 years ago
Find the sum of first 15 terms of an AP whose 4th and 9th t terms are -15 and -30 respectively.
Serga [27]

Answer:

Sum of the first 15 terms = -405

Step-by-step explanation:

a + 3d = -15 (1)

a + 8d = -30 (2)

Where,

a = first term

d = common difference

n = number of terms

Subtract (1) from (1)

8d - 3d = -30 - (-15)

5d = -30 + 15

5d = -15

d = -15/5

= -3

d = -3

Substitute d = -3 into (1)

a + 3d = -15

a + 3(-3) = -15

a - 9 = -15

a = -15 + 9

a = -6

Sum of the first 15 terms

S = n/2[2a + (n − 1) × d]

= 15/2 {2×-6 + (15-1)-3}

= 7.5{-12 + (14)-3}

= 7.5{ -12 - 42}

= 7.5{-54}

= -405

Sum of the first 15 terms = -405

7 0
2 years ago
2 4.2.3 Quiz: Slope Intercept Equation of a Line
lions [1.4K]
Substitute 2 into x in the equation so f(x)= 5x2 -12 = -2 so it’s C = -2
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2 years ago
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