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3 years ago

What is the value of the expression below plz help!

Mathematics

1 answer:

olga55 [171]3 years ago

3 0

2y^2 + 9y + 2, while y = 7

Plug 7 in for y

2(7)^2 + 9(7) + 2

Simplify

98 + 63 + 2

Add together each term

163

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Please help sorry if it’s a little blurry! I’ll mark brainliest if you tell me why you got that answer.

sergij07 [2.7K]

Answer:

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3 0

3 years ago

The total number of? restaurant-purchased meals that the average person will eat in a? restaurant, in a? car, or at home in a ye

zmey [24]

Answer:

The number of restaurant-purchased meals eaten in a restaurant is 75, the number eaten in a car is 33 and the number eaten at home is 55.

Step-by-step explanation:

Suppose, the number of meals eaten in a restaurant is $x$ , in a car is $y$ and at home is $z$

The total number of meals eaten in a restaurant, in a car or at home is given as 163. So, the first equation will be......

$x+y+z=163 .............................(1)$

The total number meals eaten in a car or at home exceeds the number eaten in a restaurant by 13. So, the second equation will be......

$y+z=x+13 ................................(2)$

Twenty more restaurant-purchased meals will be eaten in a restaurant than at home. So, the third equation will be......

$x= z+20..................................(3)$

First, substituting equation (2) into equation (1), we will get........

$x+(x+13)=163\\ \\ \Rightarrow 2x+13=163\\ \\ \Rightarrow 2x=163-13=150\\ \\ \Rightarrow x=\frac{150}{2}=75$

Now plugging this $x=75$ into equation (3), we will get......

$75=z+20\\ \\ \Rightarrow z=75-20= 55$

Plugging $x=75$ and $z=55$ into equation (1) .........

$75+y+55=163\\ \\ \Rightarrow y+130=163\\ \\ \Rightarrow y=163-130=33$

So, the number of restaurant-purchased meals eaten in a restaurant is 75, the number eaten in a car is 33 and the number eaten at home is 55.

8 0

3 years ago

Nêu mệnh đề phủ định của mệnh đề sau và xét tính đúng sai của mệnh đề phủ định: ∀x∈R:x^{2} ≠ 1

disa [49]

Answer:

true

Step-by-step explanation:

$existential \: element \: of \: real \: number \: \binom{o}{o} x {}^{2} = 1$

6 0

3 years ago

The Calef family likes to paddle along the Susquehanna River.

xxTIMURxx [149]

Answers:

a. $\frac{14}{3}=4.667$ miles/day

b. 14 miles

Explanation:

Part a:

We are given that they paddled a total distance of 14 miles for 3 days. To get the distance paddled each day, we will divide the total paddled distance by the number of days

This is done as follows:

Distance paddled each day = $\frac{14}{3}=4.667$ miles/day

Part b:

Now, we are given that:

i. They went half their daily distance:

Daily distance = $\frac{1}{2}*\frac{14}{3}=\frac{7}{3}$ miles/day

ii. They extended the trip twice as many days

Number of days = 2 × 3 = 6 days

The total distance paddled will be equivalent to the product of the distance paddled each day and the total number of days

This means that:

Total distance = $\frac{7}{3}*6=14$ miles

Hope this helps :)

4 0

3 years ago

DURING A REGULAR HALF-HOUR TV SHOW THERE ARE 8 MINUTES OF COMMERCIALS. IF EACH COMMERCIAL IS 0.25 MINUTES LONG HOW MANY COMMERCI

kirza4 [7]

Ok so there are 8 min of commercials and if each commercial is .25 minutes. what I did was 8 × 60 to get how many seconds there were. which = 480 and then I did .25 min × 60 and got 15 so I subtracted 15 from 480 and got 7.75
but it says how many commercials so you have to round to the full commercial and you get 8
so I think the answer is 8 or 7.75.

5 0

3 years ago

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