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Mekhanik [1.2K]
3 years ago
10

Picture provided help!

Mathematics
1 answer:
weqwewe [10]3 years ago
5 0

Answer:

A -60i - 14j

Step-by-step explanation:

u = -9i + 8j

v = 7i + 5j

2u = 2(-9i + 8j) = -18i + 16j

6v = 6(7i + 5j) = 42i + 30j

2u - 6v

(-18i + 16j) - (42i + 30j)

(-18i - 42i) + (16j-30j)

-60i - 14j

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Gerry plans to place a 29 foot ladder against the side of his house to clean his gutters. The bottom of the ladder will be 3 fee
tensa zangetsu [6.8K]

Answer:

8\sqrt{13}

Step-by-step explanation:

Using the pythagorean theorem (Assuming the house's walls are perpindicular to the ground):

a^2+b^2=c^2

we can find that 3=a and 29=c

3^2+b^2=29^2

9+b^2=841

b^2=832

b=\sqrt{832}

b=\sqrt{64*13}

b=8\sqrt{13}

That is the height that the ladder will reach

5 0
3 years ago
a quantity of ethanol is cooled from 47.9° C to 12.3°C and releases 3.12 KJ of heat. what is the mass of the ethanol sample?​
victus00 [196]

Answer:

35.9 grams

Step-by-step explanation:

We use the formula:

q=m*C_p*\Delta T

Where

q is heat released

m is mass

C_p is the constant 2.44

ΔT is change in temperature

We put the info in the formula and solve for m (mass):

q=m*C_p*\Delta T\\-3.12 =  m*2.44(12.3-47.9)\\-3.12*10^3=m*(-86.864)\\m=35.9

The mass of ethanol is 35.9 grams

8 0
4 years ago
A TV that usually sells for $174.97 is on sale for 20% off. If sales tax on the TV is 5%, what is the price of the TV, including
OlgaM077 [116]

The answer is basically easy. It’s $126.84.

4 0
3 years ago
Read 2 more answers
Feb 05, 3:07:40 PM
zaharov [31]
Solve (2x - 1)(3x^2 - 9x - 4)
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7 0
3 years ago
Find an equation of the line: through the point (2, −4) with a y-intercept of −2. PLEASE HELP ONLY HAVE 20 MINUTES
Ber [7]

Answer:

Y=-x-2 or Y=-1x-2

Step-by-step explanation:

5 0
4 years ago
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