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3 years ago

Find the product. (n + 7)2

Mathematics

2 answers:

masha68 [24]3 years ago

5 0

(n+7)2
= (n)(2) + (7)(2)
=2n+14

nikklg [1K]3 years ago

4 0

(n+7)(2) =(n+7)(2) =(n)(2)+(7)(2) =2n+14

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Jim began a 165 mile bicycle trip to build up stamina for a triathlete competition unfortunately his bike chain broke so he fini

denpristay [2]

Answer: Approximately 4.7 hours.

Step-by-step explanation:

He rode the bicycle for some time before it broke down and he walked the remaining distance. This means that Jim covered a total of 165 miles by riding at a speed of 35 miles per hour and walking at a speed of 3 miles per hour.

Let x = the distance covered by riding the bicycle.

Let y = the distance covered by walking.

Time = distance /speed

Time he used in riding would be x/35

Time he used in walking would be y/3

Since the entire trip took 7 hours,

x/35 + y/3 = 7

3x + 35y = 735 - - - - - - - - 1

Total miles covered is 165. Therefore,

x + y = 165 - - - - - - - - -- - -2

Substituting x = 165-y into equation 1, it becomes

3(165-y) + 35y = 735

495-3y + 35y = 735

-3y + 135y = 735-495

132y = 240

y = 240/132

y = 1.81m

x = 165 - 1.81 = 163.19

Amount of time that he spent on the bicycle will be

x/35 = 163.19/35

= 4.66

Approximately 4.7 hours.

7 0

3 years ago

If angle adc=134 and adb=5x+4 and bdc=7x-2 what does angle bdc measure

ruslelena [56]

As I've shown on picture that I attached:
∠ADC=∠ADB+∠BDC⇒134=5x+4+7x-2
12x+2=134
12x=132⇒x=132/12
x=11
Angle BDC measure 7x-2=7*11-2⇒∠BDC=75.

8 0

3 years ago

Can someone please help me ASAP

deff fn [24]

Answer:

QR = 17 cm

Step-by-step explanation:

Δ RST is a 5- 12- 13 triangle with hypotenuse RT = 13 cm , then

TS = 5 cm and PT = 2 × 5 = 10 cm

So PS = 10 + 5 = 15 cm

PS is parallel to the vertical line from vertex Q and intersects the horizontal line projected from SR of length 20 - 12 = 8 cm

Using the right triangle formed calculate QR using Pythagoras' identity

QR² = 15² + 8² = 225 + 64 = 289 ( take square root of both sides )

QR = $\sqrt{289}$ = 17

3 0

3 years ago

A spinner is spun once ( The spinner has 8 sections in it) What is the probability that the spinner will land on 5 or 7? A.8% B.

nordsb [41]

D. 25% as there are 8 sections and two wanted outcomes this can be simplified into a 1/4 so 1/4=25%

3 0

2 years ago

Solve for x. Simplify completely.<br> x^2-9=55

djverab [1.8K]

★ Exponential reduction ★

$x {}^{2} - 9 = 55 \\ x {}^{2} = 55 + 9 = 64 \\ x {}^{2} = 64 = ( + 8) {}^{2} \\ x = + 8 \\$
we didn't considered -8 because square root of any real number is always positive , or it's yours choice to deal with minus 8 also :)

★✩★✩★✩★✩★✩★✩★✩★✩★✩★✩★

8 0

3 years ago

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