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Helga [31]
3 years ago
9

This is 6th grade work there will be more questions on this but i needed help on this

Mathematics
2 answers:
sweet-ann [11.9K]3 years ago
6 0
His awnswers true so ummmmmmmmm yeah
nata0808 [166]3 years ago
3 0

Answer:

Step-by-step explanation:

X + (X + 4) + (X - 7) = 54

3X - 3 = 54

3X - 3 + 3 = 54 + 3

3X = 57

3X / 3 = 57 / 3

X = 19

Y = (19 + 4) = 23

Z = (19 - 7) = 12

Sam's age = 19

Dana's age = 23

Alex's age = 12

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How do I solve #7? do i add all the angles together like a normal triangle and make it equal to 180?
kobusy [5.1K]

Answer:

126 degrees

Step-by-step explanation:

Triangle: y = 180 - (5x + 4x)

Straight angle: y = 180 - (4x + 30)

180 - (5x + 4x) = 180 - (4x + 30)

5x + 4x = 4x + 30

5x = 30

x = 6

Angle:

y = 180 - (5x + 4x)

y = 180 - 9x

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7 0
2 years ago
Find the sum of the first 9 terms of the sequence. Show all work for full credit.
Kamila [148]
We can see the sequence goes by decreasing 9 on each number

so the numbers are

2, -7, -16, -25, -34, -43, -52, -61, -70

so adding all these numbers we get

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= -306


hope this helped
6 0
3 years ago
If P(n) and Q(n) are polynomials of degree j and k, respectively, then the series
Naya [18.7K]

Answer:

converges

Step-by-step explanation:

well the two polynomials in the series are 1 and n^8 (I'm assuming the +7 is not in the decimal but it seems to not matter). The degree of the polynomial 1 is 0 which can be represented by 1x^0. The second polynomial in the denominator has a degree of 8. So j = 0  and k = 8. Since 0 < (8-1)

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6 0
2 years ago
a tree rhar is 8 feet tall is growing at a rate of 2 feet each year a tree is 13 feet tall is growing at a rate of 1 foot each y
Vlad [161]

Answer:

  5 years

Step-by-step explanation:

The shorter tree is 5 ft shorter, but is growing 1 ft/year faster. It will make up the difference of 5 ft in (5 ft)/(1 ft/year) = 5 years.

8 0
3 years ago
Solve for x:(-771)+x=0
NeX [460]

Answer:

x=771

Step-by-step explanation:

−771 + x = 0

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x − 771 + 771 = 0 + 771

4 0
3 years ago
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