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3 years ago

Sara says, "If you subtract 19 from my number and multiply the difference by - 2, the result is -4."

Mathematics

2 answers:

denis-greek [22]3 years ago

8 0

Her number is 27, I hope

andrey2020 [161]3 years ago

7 0

I don’t know how you got 27 but that’s not right. Sara’s number is 21. Because this is the problem

X=Sara’s number
(19-x) • 2 = -4
38-2x = -4
To bring 38 to the other side subtract it
-2x = -4 -38
-2x= -42
Divid -2 by -42 to get X by itself
X = 21

Put X into the equation to check
(19-21) •2= -4
-2•2 = -4
-4=-4

If I got that wrong I’m sorry and I’m sorry for being cocky but 27 doesn’t make sense but I could have gotten the equation wrong in the beginning

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i just confused on what the triangular prisms volume is. i think i’m doing it correctly but online says something different.

DanielleElmas [232]

Answer:

The answer for just the triangular prism's volume is 175 inches cubed.

If you need me to add how to find the volume of the rectangular prism, please comment that you also need this then.

Step-by-step explanation:

A triangular prism's volume is equal to the base area (which is a triangle) multiplied by the length of the prism.

So find the area of the triangle and multiply it by 10 inches in this case.

So they are going to try to confuse on the triangle here because of they give three measurements where one of them is unnecessary in the formula .5bh.

The b and h represent the base and height respectively. The base and height of a triangle when intersected form 90 degree angle.

So we are using the 5 inches and 7 inches for it's height and base respectively.

The 9 inches is unnecessary in the calculation.

The volume if the triangular prism is found by doing .5(7)(5) times 10. The answer is in inches cube since inches*inches*inches=inches cubed or in^3.

.5(7)(5)(10)

.5(10)(7)(5)

(5)(35)

175

The answer for just the triangular prism's volume is 175 inches cubed.

If you need me to add how to find the volume of the rectangular prism, please comment that you also need this then.

4 0

3 years ago

Y is directly proportional to x and k is a constant. Which equation

inn [45]

It would be Y=kx.
Look at photo for explanation

7 0

3 years ago

Read 2 more answers

Which recursive formula defines this sequence for n > 1?

Sergeeva-Olga [200]

Answer:

(B) $a_n=a_{n-1}+3$

Step-by-step explanation:

Given the sequence: 3, 6, 9, 12, 15, 18, ...

6=3+3

9=6+3

12=9+3

If we continue in like manner, we notice that the nth term ( $a_n$ ) is an addition of 3 to the previous term ( $a_{n-1}$ ).

Therefore (for n>1), the recursive formula which defines the sequence is:

$a_n=a_{n-1}+3$

The correct option is B

8 0

3 years ago

Given that the area of a trapezoid is given by the formula A = 1/ 2 h(b1 + b2), what is the value of A if h = 2 cm, b1 = 3, and

Wewaii [24]

Answer:

A=7

Step-by-step explanation:

A=1/2h(b1+b2)

plug in what you know

A=1/2x2(3+4)

PEMDAS

A=1/2x2(7)

A=1/2x14

A=7

8 0

4 years ago

What error was made? -4(6 - b) = 4 -24 - 4b = 4 -4b = 28 b = -7

lisov135 [29]

Answer:

step 2; a negative times a negative = a positive.

Step-by-step explanation:

-4(6-b)=4

-24 +4b=4

4b=28

b=7

3 0

3 years ago