All categories

2 years ago

Twice a number subtracted from four times a number, added to 15? anyone help?

Mathematics

1 answer:

Wittaler [7]2 years ago

7 0

Answer:

2x - 4y + 15

Step-by-step explanation:

You might be interested in

Select Yes or No to indicate whether each of the ordered pairs is most likely a solution to the equation represented by the grap

maria [59]

Yes, yes, no I believe

7 0

3 years ago

Can you tell what is the answer to this math problem ?

Marrrta [24]

X^2-18 = 3x

x^2 - 3x - 18 = 0

(x-6)(x+3) = 0

x = {-3,6}

So -3 is the answer

3 0

2 years ago

Describe four real-life situations in which you might need to add or subtract decimals.

Hatshy [7]

If youre a cashier
if youre a mathematician
if you have to pay taxes and bills
if your have to loan something

5 0

2 years ago

Read 2 more answers

Find the cosine of angle A to the nearest 100th.

Sauron [17]

Answer:

${ \tt{ \cos(A) = \frac{ \sqrt{700} }{40} }} \\ { \tt{ \cos(A) = 0.66 }}$

4 0

2 years ago

If a = 7 and b = 11, what is the measure of ∠B? (round to the nearest tenth of a degree) A) 32.5° B) 39.2° C) 50.5° D) 57.5°

Ilia_Sergeevich [38]

Answer:

D) 57.5°

Step-by-step explanation:

As the question is not complete. So, let's suppose it is a right angle triangle then, we can apply Pythagoras theorem to calculate the hypotenuse or the third side.

Pythagoras Theorem = $c^{2}$ = $a^{2} + b^{2}$

a = 7 and b = 11

$a^{2}$ = 49

$b^{2}$ = 121

Plugging in the values, we will get:

$c^{2}$ = 49 + 121

$c^{2}$ = 170

c = $\sqrt{170}$

To calculate the unknown angle B, we can use law of sine.

Law of sine = $\frac{a}{sinA}$ = $\frac{b}{sinB}$ = $\frac{c}{sinC}$

So,

$\frac{c}{sinC}$ = $\frac{b}{sinB}$

$\frac{\sqrt{170} }{sin90}$ = $\frac{11}{sinB}$

Sin90 = 1

sinB = $\frac{11}{\sqrt{170} }$

B = $sin^{-1}$ ( $\frac{11}{\sqrt{170} }$ )

B = 57.5°

8 0

3 years ago