2 years ago

.7 times 4 all this is for a question

Mathematics

1 answer:

anyanavicka [17]2 years ago

3 0

Answer:

7777

Step-by-step explanation:

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18. The sum of 10 times a number and fifteen is added to eleven times the same number.

sergij07 [2.7K]

Answer:

Sum of 10 times a number and fifteen is added to eleven times the same number is therefore: 10x + 15 + 11x = 21x + 15

Step-by-step explanation:

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3 years ago

9sin(2x) sin (x) = 9cos(x)

nikdorinn [45]

Answer:

$\sin(2x) = 2 \sin(x) \cos(x) \\ 9( 2 \sin(x) \cos(x) ) \sin(x) = 9 \cos(x) \\ 18 { \sin}^{2} (x)9 \cos(x) - 9 \cos(x) = 0 \\ 9 \cos(x) (2{ \sin}^{2} (x) - 1) = 0 \\ 9 \cos(x) = 0 \: or \: 2{ \sin}^{2} (x) - 1 = 0 \\ \sin(x) = \pm \frac{1}{ \sqrt{2} } \\ \cos(x) = 0 \\ x = { \cos}^{ - 1} (0) \\ x = \frac{ \pi}{2} = 90 \degree \\ x = \frac{ \pi}{2} + 2\pi \: n \: \forall \: n \: \in \: \Z \\ = 90 \degree + 360\degree\: n \: \forall \: n \: \in \: \Z \\ = \pm\frac{ \pi}{4} \pm2\pi \: n \: \forall \: n \: \in \: \Z \\ x = \pm45\degree \pm 360\degree\: n \: \forall \: n \: \in \: \Z$

8 0

2 years ago

Will is w years old.

Furkat [3]

Ben = e
Jan = 2e

2e = w (not will)

8 0

3 years ago

Dan is on his way home in his car. He has driven 10 miles so far, which is one-half of the way home. What is the total length of

dusya [7]

Answer:

20 miles

Step-by-step explanation:

10miles × 2 = 20miles

3 0

3 years ago

Read 2 more answers

Help!!

lora16 [44]

False

(5,5)
y < x + 3
5 < 5 + 3
5 < 8 (correct)

(5,5)
y > -2x - 1
5 > -2(5) - 1
5 > -10 - 1
5 > -11 (correct)

so (5,5) is a solution..and there are many more

8 0

3 years ago