MATHEMATICS HIGH SCHOOL

I need help with this

Answers

Answer 1

Answer:

Answer:

a)7x - 10

b) 70 g

Step-by-step explanation:

Mass of 1st chemical which was mixed = 10g

Mass of 2nd chemical which was mixed = 2x

Mass of 3rd chemical which was mixed = 5x-20

So total mass of the the mixture which was formed after mixing all the 3 chemicals are =

10 + 2x + 5x - 20

=> 7x - 10

Mass of the mixture = 235 g

From (a) , we know that

7x - 10 = 235

=> 7x = 235 + 10 = 245

=> x = 245 / 7 = 35

Hence x = 35

We also know that mass of the 2nd chemical was = 2x.

So putting the value of x gives :-

2 × 35 = 70 g

Related Questions

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What is 7% tax on a $9.79 purchase
How many Times greater is the value of 3 in 300 then the value of the 3 in 300
The temperatures recorded one day at two cities are shown below:City L: −8° F City M: −9° F Which statement about the temperatures at the two cities is true? City M was warmer than City L because −9° F < −8° F. City M was warmer than City L because −9° F > −8° F. City M was colder than City L because −9° F > −8° F. City M was colder than City L because −9° F < −8° F.
Find the equation of the line that passes through the points (-800,200)and(-400,300).

How do I answer #38? I was thinking 1/4...

Answers

look at the attached picture

Which of the following is the conjugate of a complex number with 5 as the real part and −2i as the imaginary part?Answers:

5 + 2i

−5 − 2i

−5 + 2i

5 − 2i

Answers

Answer: the correct option is

(A) 5 + 2i.

Step-by-step explanation: We are given to select the complex number that is the conjugate of a complex number with 5 as the real part and −2i as the imaginary part.

We know that

a complex number z can be written as

z = a + bi, where a is the real part and bi is the imaginary part.

According to the given information, we have

a = 5 and b = -2i

So, z = 5 - 2i.

Therefore, the conjugate of z is given by

$\bar{z}=5+2i.$

Thus, the required conjugate number is 5 + 2i.

Option (A) is CORRECT.

5+2i. You only have to change the operation of the original expression, not the signs (positives and negatives) of each term.

Which of the following is equiangular and equilateral?A. rhombus
B. square
C. rectangle
D. parallelogram

Answers

I think its B because squares has equal sides and angles

Square is the correct answer

9. If the area of a rectangle measures 20 square inches, the side lengthsmust be 4 inches and 5 inches.

Answers

Answer:

True

Step-by-step explanation:

The given statement is true.

Area of a rectangle is length times width.

A rectangle with the side length of 4 and 5 inches would have an area of 20 square inches.

$A=l*w\n\nA=4*5\n\nA=20$

Hope this helps.

Answer:

False

Step-by-step explanation:

There can be two sets of side lengths 4, 5 inches and 2, 10 inches.

How to find hyptenuse of a triangle?

Answers

IF the triangle has a 90-degree angle in it (it's a right triangle), then the length
of the hypotenuse is:

Square root of (square of the shortest side + square of the medium side).

If the triangle is not a right triangle, then it doesn't have a hypotenuse.

A customer buys five cans of baked beans, four pocket of brown sugar and two pockets from the supermarket. He gives the cashier 150 and gets 26 in change, a can of baked beans costs half as much as pocket of biscuits whilst a packet of sugar is three rand cheaper than a packet of biscuits.1. how much did all items cost
2. calculate the cost of a can of baked beans, sugar, and biscuits
3. How much will eight cans of baked beans, one packet of sugar and six pockets of biscuits cost?

Answers

The question has 3 unknowns thus we need three equations to fully solve the problem.
We let x = the price of a can of baked beans, y = the price of a packet of sugar and z = the price of a packet of biscuit
From the given, we generate the following equations;
<1> 5x+4y+2z = Amount spent = 150-26 = 124
<2> z = 2x
<3> y = z -3
We use equation 2 and 3 to substitute to equation 1 in order to obtain the value of x.
5x + 4 (2x - 3) + 2(2x) = 124
5x + 8x - 12 + 4x = 124
17x = 136
x = 8 (price of a can of baked beans)
y= (2 x 8) - 3 = 13 (price of a packet of sugar)
z= 2 x 8 = 16 (price of a pocket of biscuit)

For the new set of conditions,
8x + y + 6z = (8 x 8) + 13 +(6 x 16) = 173 (Cost for the new set of conditions)

let's make b the can of baked beans.

Then biscuits are twice its prize, 2b.

s, the packet of sugar is 2b-3 - thre rand cheaper than a packet of biscuits.

1) the custommer bought:
buys five cans of baked beans, four pocket of brown sugar and two pockets

5b+4* (2b-3)+2*2b

now we calculate:

5b+4* (2b-3)+2*2b=5b+8b-12+4b=13b-12+4b=17b-12

this is equal to 150-26=124

so 17b-12=124
17b=136
b=8
So the beans cost 8, biscuits cost 8*2=16, and sugar 16-3=13
2) this would be:
8+13+16=21+16=37
3)This would be:

8*8+13+6*16=64+13+96=173

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