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2 years ago

Help me please i need some help.

Mathematics

2 answers:

e-lub [12.9K]2 years ago

7 0

True. they are both x so they are like terms

Natali5045456 [20]2 years ago

7 0

Answer:

Step-by-step explanation:

its true because they both have x

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Write the equation of a horizontal line that passes through the point (3,-3).

cestrela7 [59]

Hello :
the equation is : y -(-3) = 0(x-3)....(slope = 0 'horizontal line')
y=-3

4 0

3 years ago

In a certain chemical, the ratio of zinc to copper is 3 to 16. A jar of the chemical contains 736 grams of copper. How many gra

evablogger [386]

The jar has 138 grams of zinc.

Solution:

Given that , In a certain chemical reaction, the ratio of zinc to copper is 3 to 16.

A jar of the chemical contains 736 grams of copper.

We have to find how many grams of zinc does it contain

Let "n" be the grams of zinc needed for 736 grams of copper

Now, we know that,

16 grams of copper ⇒ 3 grams of zinc

Then, 736 grams of copper ⇒ n grams of zinc

So, by criss cross multiplication,

$n \times 16 = 3 \times 736$

16n = 3 x 736

16n = 2208

n = 138

Hence, the jar has 138 grams of zinc.

5 0

3 years ago

An inlet pipe on a swimming Pool can be used to fill the pool in 36 hours. The drainpipe can be used to empty the pool in 40 hou

krok68 [10]

So 2/3 of 36 is 24. So 24 that were filled and 2/3 of 40 is 80/3 which equals 26 2/3 to drain it. And then to fill the pool would be 36 hours. What's so hard...

7 0

3 years ago

How do I solve literal equations? Ex. P=2(a+b) solve for b

son4ous [18]

Sounds like rearranging to me:

P=2(a+b) -- expand brackets
P=2a+2b -- subtract 2a
P-2a=2b -- divide by 2

b=(P-2a)/2

8 0

3 years ago

Read 2 more answers

A student stands 20 m away from the foot

Ostrovityanka [42]

Answer:

Height of tree is $\approx$ 15 m.

Step-by-step explanation:

Given that student is 20 m away from the foot of tree.

and table is 1.5 m above the ground.

The angle of elevation is: 34°28'

Please refer to the attached image. The given situation can be mapped to a right angled triangle as shown in the image.

AB = CP = 20 m

CA = PB = 1.5 m

$\angle C$ = 34°28' = 34.46°

To find TB = ?

we can use trigonometric function tangent to find TP in right angled $\triangle TPC$

$tan \theta = \dfrac{Perpendicular}{Base}\\tan C= \dfrac{PT}{PC}\\\Rightarrow tan 34.46^\circ = \dfrac{PT}{20}\\\Rightarrow PT = 20 \times 0.686 \\\Rightarrow PT = 13.72\ m$

Now, adding PB to TP will give us the height of tree, TB

Now, height of tree TB = TP + PB

TB = 13.72 + 1.5 = 15.22 $\approx$ 15 m

7 0

3 years ago