Pls pls help me pls Patricia is testing some mineral properties to help her identify each mineral. For one test, she scrapes a mineral on a special plate to observe the color left behind.

For which of the following properties of minerals is she MOST LIKELY using this test?

Group of answer choices

cleavage

hardness

luster

streak

Keesha is conducting several tests on minerals to help identify them. She uses a small hammer to break the mineral. Which property of the mineral might Keesha be testing?

Group of answer choices

cleavage

texture

luster

streak

Haley tests the streak of two mineral samples using a streak plate. Both minerals leave a pale yellow streak. Which of the following might Haley conclude about the two mineral samples?

Group of answer choices

They both have dull luster.

They are very soft minerals.

They could be the same mineral.

They are both very hard.

The students in Mr. Leone’s class are studying rocks. The students tell Mr. Leone that several of their rocks are sedimentary. Which of the following could the students use as evidence for their thinking?

Group of answer choices

The rocks are grainy.

The rocks contain fossils.

The rocks are heavy.

The rocks have large crystals.

Hope This Helps!

Step-by-step explanation:

1: Streak: Streak is a word referring to the color of the streak that a rock makes when it is scraped against the unglazed side of a white ceramic tile (or, the unglazed bottom of a white coffee cup or toilet tank cover).

2: Luster: The luster of a mineral is best observed on a surface that is free of moisture, dirt, tarnish, and abrasion. Geologists in the field usually carry a rock hammer to break rocks so that their true luster and color can be observed.

3: They could both be the same mineral: The minerals pyrite and gold are always metallic yellow in color and streak (although they differ in other characteristics such as hardness).

4: The rocks contain fossils: Sedimentary rocks are most likely to contain fossils. Fossils are formed when the bodies or remnants of living organisms (plants and animals) are covered and are thus protected from predators or microbial decay. And thats exactly what a sedimentary rock is.

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

what is the model?

step-by-step explanation: