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3 years ago

Someone please help me

Mathematics

2 answers:

rusak2 [61]3 years ago

7 0

Answer: 102 degrees

Snezhnost [94]3 years ago

5 0

Answer:

102

Step-by-step explanation

A straight line is 180, half of 360. So if you have 78, you subtract it from 180 to get 102.

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Please help me! Please don't get it wrong ;-;

polet [3.4K]

Answer:

Its 40 degrees

Step-by-step explanation:

60+80=140

180-140=40 (a straight line is always 180 degrees)

Hope it helped

3 0

3 years ago

3. A number d is decreased by 5 and then doubled.

a_sh-v [17]

Answer: 3. (d-5)x2

4. (I don't know)

5.(25+h)/f^3

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

Help me asap! I will give you marks

Law Incorporation [45]

Recall the binomial theorem.

$(a+b)^n = \displaystyle \sum_{k=0}^n \binom nk a^{n-k} b^k$

1. The binomial expansion of $\left(1+\frac x3\right)^7$ is

$\left(1 + \dfrac x3\right)^7 = \displaystyle\sum_{k=0}^7 \binom 7k 1^{7-k} \left(\frac x3\right)^k = \sum_{k=0}^7 \binom 7k \frac{x^k}{3^k}$

Observe that

$k = 1 \implies \dbinom 71 \left(\dfrac x3\right)^1 = \dfrac73 x$

$k = 2 \implies \dbinom 72 \left(\dfrac x3\right)^2 = \dfrac73 x^2$

When we multiply these by $8-9x$ ,

• $8$ and $\frac73 x^2$ combine to make $\frac{56}3 x^2$

• $-9x$ and $\frac73 x$ combine to make $-\frac{63}3 x^2 = -21x^2$

and the sum of these terms is

$\dfrac{56}3 x^2 - 21x^2 = \boxed{-\dfrac73 x^2}$

2. The binomial expansion is

$\left(2a - \dfrac b2\right)^8 = \displaystyle \sum_{k=0}^8 \binom 8k (2a)^{8-k} \left(-\frac b2\right)^k = \sum_{k=0}^8 \binom 8k 2^{8-2k} a^{8-k} b^k$

We get the $a^6b^2$ term when $k=2$ :

$k=2 \implies \dbinom 82 2^{8-2\cdot2} a^{8-2} b^2 = 28 \cdot2^4 a^6 b^2 = \boxed{448} \, a^6b^2$

6 0

1 year ago

Given f(x) = -x + 1, solve for x when f(x) = 0.

Ymorist [56]

Answer:

Step-by-step explanation:

0=-x+1

-x=-1

x=1

4 0

3 years ago

Tom has read 2 books for school. Tom read 1/2 of the first book on Thursday and 5/12 of the second book on Friday. What total fr

Mandarinka [93]

Answer:

35/12

Step-by-step explanation:

1 1/2+1 5/12

=3/2+17/12

=3*6+17*1/12

=18+17/12

=35/12

3 0

3 years ago