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4 years ago

Find the value of 3u-8 given that -7u + 9=2

Mathematics

2 answers:

bulgar [2K]4 years ago

8 0

Answer:

-5

Step-by-step explanation:

-7u+9=2

-7u=2-9

-7u=-7

7u=7

u=7/7

u=1

3(1)-8=3-8=-5

eduard4 years ago

8 0

Step 1: Solve for u using the equation -7u+9=2

-7u+9=2
-9 -9
_________
-7u=-7
__ __
-7 -7
_________
U=-1

Step 2: Substitute u into 3u-8

3u-8
3(-1) -8
-3 -8
-11

The value of 3u-8 is -11

Hope this helps comment below for more questions :)

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<h2>Answer:</h2>

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3 years ago

Simplify. 42+25 A.21 B.29 C.41 D.51

bearhunter [10]

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3 years ago

A 13?-foot board is cut into two pieces. The longer piece is 7.5 feet longer than the shorter piece. What is the length of each?

chubhunter [2.5K]

Answer:

The smaller board would be 2.75 feet and the longer one would be 10.25 feet.

Step-by-step explanation:

In order to find this, assume the shorter board is equal to x. Next, we would know that the longer board would be equal to x + 7.5. Using these two assumptions, we can add the lengths together, set equal to 13 and then solve for x.

x + (x + 7.5) = 13

2x + 7.5 = 13

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3 years ago

Find the area of the irregularly-shaped hexagon below

Ber [7]

let each box length be 1

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area=½(2)(3)

for blue marked boxes

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3 years ago

Read 2 more answers

Suppose you are climbing a hill whose shape is given by the equation z = 1300 − 0.005x2 − 0.01y2, where x, y, and z are measured

Lisa [10]

Answer:

a) "ascend"

Step-by-step explanation:

The equation is $z = 1300-0.005x^2-0.01y^2$

This question is asking for the value of the directional derivative in the direction of -j [since south that's y negative]

So, this is the negative of partial derivative of y. Thus we have:

$z = 1300-0.005x^2-0.01y^2\\z_y=-0.02y$

Now we are at (100,120,1106), we take y value of 120 and put it in the partial:

$z_y=-0.02y\\z_y=-0.02(120)\\z_y=-2.4$

We take the negative, that is -(-2.4) = 2.4

Since this is positive, we can say the hill is sloping upward at this point, so you will start to ascend.

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3 years ago