2 years ago

Evaluate: 4×2²-10÷2+5

Mathematics

2 answers:

inna [77]2 years ago

7 0

Answer:

Hi! The correct answer is 16!

Step-by-step explanation:

Simplify the expression

pychu [463]2 years ago

6 0

Answer:

The answer is 16.

Step-by-step explanation:

Simplify the expression.

Hoped this helped!

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21 Q please in the picture

Anika [276]

Answer:

3 unites up

Step-by-step explanation:

is the answer to that question

6 0

3 years ago

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John is filling the bathtub that is 18 inches deep. He notices that it takes two minutes to fill the tub with three inches of. W

morpeh [17]

Answer: No he isn't correct because it would take 12 minutes to fill the bathtub up 18 inches if it continued at the same rate

Step-by-step explanation:

3/2 does not equal 18/10

8 0

3 years ago

Find a1, for the arithmetic series<br> with S14 = - 420 and d = -6.

faust18 [17]

$\bf n^{th}\textit{ term of an arithmetic sequence} \\\\ a_n=a_1+(n-1)d\qquad \begin{cases} a_n=n^{th}\ term\\ n=\textit{term position}\\ a_1=\textit{first term}\\ d=\textit{common difference}\\ \cline{1-1} n = 14\\ d= -6 \end{cases} \\\\\\ a_{14}=a_1+(14-1)(-6)\implies a_{14}=a_1+(13)(-6)\implies a_{14}=a_1-78 \\\\[-0.35em] ~\dotfill$

$\bf \textit{sum of a finite arithmetic sequence} \\\\ S_n=\cfrac{n(a_1+a_n)}{2}\qquad \begin{cases} a_n=n^{th}\ term\\ n=\textit{last term's}\\ \qquad position\\ a_1=\textit{first term}\\ \cline{1-1} n= 14\\ S_{14}=-420\\ a_{14}=a_1-78 \end{cases}\implies S_{14}=\cfrac{n(a_1+a_{14})}{2} \\\\\\ -420=\cfrac{14[a_1+(a_1-78)]}{2}\implies -420=7(2a_1-78)\implies \cfrac{-420}{7}=2a_1-78 \\\\\\ -60=2a_1-78\implies 18=2a_1\implies \cfrac{18}{2}=a_1\implies 9=a_1$