3 years ago

Evaluate expression when r= 9 3 (5r-3)-2 (6r-7)

Mathematics

1 answer:

Mama L [17]3 years ago

7 0

Answer:

Step-by-step explanation:

Substitute the value of the variable into the equation and simplify.

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What is (4a²)³÷8a²? can you please answer in normal number form (not like 3²)

AleksandrR [38]

Answer:

$8a^4$

Step-by-step explanation:

Hello! $(4a^2)^3=4\cdot4\cdot4\cdot a^2\cdot a^2\cdot a^2=64a^6$ because if you multiply numbers with exponents you add the exponents.

Now we've got $\frac{64a^6}{8a^2}=8a^4$ .

Sadly it has to be in exponential form. You can substitute $a$ into the equation if you know a.

3 0

3 years ago

Help please ASAP please I’ll mark you as brainlister

storchak [24]

Answer:

a = 4

Step-by-step explanation:

$\sin(theta) = \frac{opposite}{hypotenuse}$

$\cos(theta) = \frac{adjacent}{hypotenuse}$

$\tan(theta) = \frac{opposite}{adjacent}$

hypotenuse = a

opposite = 2√3

adjacent = b

theta = 60°

the best formula to use is the first formula cause we have all the values to substitute in it in order to find the value of a

$\sin(60) = \frac{2 \sqrt{3} }{a}$

$\frac{2 \sqrt{3} }{ \sin(60) } = a$

$4 = a$

$a = 4$

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3 years ago

What is 15x+8y less than or equal to 64

navik [9.2K]

Less than, because if you add 15+8 it equals 23 so less than

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4 years ago

Simplify 8i^6+6i^5-5i^3-3i^2-7i-9 A) -14+4i B) -4+4i C) -10i D) -14-18i

kipiarov [429]

The answer is A) -14 + 4i. God bless!

7 0

3 years ago

Read 2 more answers

A boat goes 3/4 hours with a speed of 8mph and 1/3 hours with a speed of 12mph. What distance did the boat cover in all this tim

Ludmilka [50]

Answer:

10 miles

Step-by-step explanation:

Distance d = v t

v - speed/velocity

t - time

d = $\frac{3}{4}$ (8) + $\frac{1}{3}$ (12) = 6 + 4 = 10 miles

4 0

3 years ago