What number should be added to the expression x^2 + 4x to change it into a perfect square trinomial?

Answers

Answer 1

Answer: x^2 + 4x
the number to be added is found by dividing the constant of x by 2
and squared the number
so # to be added = ( 4/2)² = 4
the perfect square trinomial is
x² + 4x + 4 = (x + 2 )² which is a perfect square trinomial
I hope this help you

Answer 2

Answer: he number that must be added is four because (x+2)^2=x^2+4x+4

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25% of what number is 15

Javier bought 48 sports cards at a yard sale. Of the cards, 3/8 were baseball. How many cards were baseball cards ?

Answers

3/8=.375

48×.375=18

hope this helps

48 times 3/8
8units =48
1unit = 6
3units =18

The dimensions of a rectangle whose area is x^2 + 4x square units are

Answers

Answer:

x and x+4

Step-by-step explanation:

since area is product of length and breadth for a rectangle . if we factorise the area given , take x as common the other expression comes out to be x+4 . hence dimensions are x and x+4

Explain how am estimate helps you to place the decimal point when multipling 3.7 X 5.1

Answers

well 3.7×5.1 put the decimals at the end so 37×51=1887 there is 2 decimals so it should be 18.87 you put it back 2 spaces since there's 2 decimals

Since 3*5=15, then the answer to 3.7*5.1 should be close to that same value. But if you were solving it by hand, and accidentally wrote the answer as 1.887 or 188.7. Estimating helps you know that you placed the decimal in the wrong area, Since the number isn't close to 15.3.7*5.1+18.87

Emily buys a toaster during the sale for 10% off. If Emily pays $36, what was the original price?

Answers

100-10=90%
make proportion
x$-100%
36$-90%
x*90=100*36
x=3600/90
x=40$

Answer:

$40

Step-by-step explanation:

so first you do 34792x3957935 then you get 137704474520 and because it is 10% you make it .04 making that 40$

(x+5)(x-7)=x^2
What does x equal?

Answers

x^2-2x-35=x^2
-2x=35
x=-17.5

x = { -6, 2}........ hope this will help!!!

Each day, Martin lifts weights for 10 minutes and runs on the treadmill for 25 minutes. Wrire two equivalent expressions and then find the total minutes that Martin exercises in 7 days.

Answers

10 x 7 = ?(70) 25 x 7 = ?(175) 175 + 70 = 245

Final answer:

Martin spends 35 minutes exercising daily. Two equivalent expressions to find his exercise time in 7 days are '7 * 35' and '(7 * 10) + (7 * 25)'. Thus, Martin exercises for a total of 245 minutes in 7 days.

Explanation:

First, let's determine the total amount of time Martin exercises daily. He lifts weights for 10 minutes and runs on the treadmill for 25 minutes. Thus, the total time he spends exercising each day is 10 minutes (weightlifting) + 25 minutes (treadmill) = 35 minutes.

Two equivalent expressions for Martin's total exercise time in 7 days can be represented as:

7 (days) * 35 (minutes/day)
(7 days * 10 minutes/day) + (7 days * 25 minutes/day)

In both cases, they lead to the same conclusion. Hence, the total time Martin spends exercising in 7 days is 7*35 =245 minutes.

Learn more about Mathematics (Time calculation) here:

brainly.com/question/26854035

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