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3 years ago

Find an explicit formula for the following sequence, an, which starts with a1=7. 7,−14,28,−56,112,…

Mathematics

2 answers:

Digiron [165]3 years ago

6 0

Answer:

simply multiply each number by -2

Step-by-step explanation:

7 * -2 = -14 -14 * -2

brainliest answer plz!

natali 33 [55]3 years ago

5 0

Answer:

aₙ= 7*(-2)ⁿ⁻¹

Step-by-step explanation:

7,−14,28,−56,112,…

This is a GP with first term of 7 and common ratio of -2

a₁=7

r= -2

aₙ= 7*(-2)ⁿ⁻¹

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Are the ratios 2:1 aand 18:9 equivalent

Norma-Jean [14]

First bring them to common denominator.

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3 years ago

What is angle B? 1. 65° 2. 55° 3. 35° 4. 90°

vfiekz [6]

Answer:

22°

Step-by-step explanation:

what you do is you take the angles 35° and 90°

You add them up, that would be 125°

the actual equation would be

$35+90=180$

$125=180$

$-125$

------------------

∠ B= 22°

Hope this helps!

Reason this is wrong is i didn't notice the 10 cm

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2 years ago

40 PONITS

Alex787 [66]

Hence, second option is the true option. {Result of spin, card color}

{Green, Purple} {Yellow, Purple} {Purple, Purple }

{Green, Green} {Yellow, Green} {Purple, Green}

Step-by-step explanation:

It is given that:

A spinner with 3 equal sectors is shown in the figure. The colors Green, Yellow, and Purple are marked on it.

Two cards are shown on the right side. Their colors are Purple and Green.

The table that identifies the sample space of spinning the spinner and then selecting a card is:

{Result of spin, card color}

{Green, Purple} {Yellow, Purple} {Purple, Purple }

{Green, Green} {Yellow, Green} {Purple, Green}

( Since in rest of the options the red color in the sample space but there is no card or no such color in the spin which is red)

6 0

2 years ago

Read 2 more answers

Evaluate 3xy + b if x = -4 ,y = 2 , and b = 5

olga2289 [7]

Answer:

-19

Step-by-step explanation:

ok so since they give you all the variables you can substitute their values

for example instead of 3xy you can write 3*(-4)y

so that is the basic idea for this problem

after substituting, the new equation is 3*(-4)*2 +5

i plan on using order of operations, or PEMDAS

3*(-4)=(-12)

(-12)*2=(-24)

-24+5=-19

so the answer is -19

hope this helps!

3 0

3 years ago

What is the value of x innthe equation 1.5(x+4)-3=4.5(x-2)

daser333 [38]

$~~~~~~1.5(x+4)-3 = 4.5(x-2)\\\\\implies 15(x+4) -30 =45(x-2)~~~~~~~~;[\text{Multiply both sides by 10]}\\\\\implies 3(x+4)-6=9(x-2)~~~~~~~~~~;[\text{Divide both sides by 5]}\\\\\implies 3x+12-6=9x-18\\\\\implies 3x+6=9x-18\\\\\implies 9x-3x = 18+6\\\\\implies 6x = 24\\\\\implies x = \dfrac{24}6\\\\\implies x =4$

3 0

2 years ago